Non-bearing type rear auxiliary frame, chassis assembly and vehicle

Abstract

The invention discloses a non-bearing type rear auxiliary frame, a chassis assembly and a vehicle. The non-bearing type rear auxiliary frame comprises a motor mounting beam frame and two longitudinal main beam frames. The motor mounting beam frame is used for mounting a driving motor and comprises a left longitudinal beam, a right longitudinal beam, a front cross beam and a rear cross beam, the left longitudinal beam and the right longitudinal beam are arranged in a spaced mode, the front cross beam and the rear cross beam are connected between the left longitudinal beam and the right longitudinal beam, and the left longitudinal beam, the right longitudinal beam, the front cross beam and the rear cross beam define a motor containing space used for containing the driving motor. The longitudinal main beam frames are used for being connected with a vehicle body floor assembly, the two longitudinal main beam frames are connected to the side, away from the right longitudinal beam, of the left longitudinal beam and the side, away from the left longitudinal beam, of the right longitudinal beam correspondingly, and the two longitudinal main beam frames are each provided with a plurality of vehicle body mounting structures and a plurality of suspension mounting structures. By means of the mode, the rear auxiliary frame is high in integration degree, a platform chassis assembly is formed, diversified whole vehicle development requirements are met, and product iteration is accelerated.

Description

Technical Field

[0001] The present application belongs to the field of automotive technology, and specifically relates to a non-load-bearing rear subframe, a chassis assembly, and a vehicle. Background Art

[0002] The rear system structure of a conventional new energy vehicle typically consists of a body frame and a powertrain. The body frame includes the rear body frame and rear floor, which typically includes the rear longitudinal beams. The powertrain includes the drive motor, rear subframe, and suspension. The rear of existing vehicles typically connects the body frame and powertrain through the connection between the rear longitudinal beams and the rear subframe.

[0003] Existing rear body longitudinal beams and rear subframes are usually developed and designed independently. They have numerous and complex parts, and the production and management costs are high. In addition, when the traditional rear subframe is assembled with the body frame, the overall technical structure is too closely connected. When there is a change in the vehicle model, the rear body longitudinal beams, rear floor and rear subframe all need to be redeveloped, resulting in a long overall product iteration cycle and high costs. Summary of the Invention

[0004] The present application provides a non-load-bearing rear subframe, chassis assembly and vehicle. The rear subframe has a high degree of integration, forming a platform chassis assembly, meeting diversified vehicle development needs and accelerating product iteration.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: providing a non-load-bearing rear subframe, including a motor mounting beam and two longitudinal main beams; the motor mounting beam is used to install a drive motor, and the motor mounting beam includes a left longitudinal beam, a right longitudinal beam and a front cross beam and a rear cross beam connected between the left longitudinal beam and the right longitudinal beam. The left longitudinal beam, the right longitudinal beam, the front cross beam and the rear cross beam together form a motor accommodating space for accommodating the drive motor; the longitudinal main beam is used to be connected to the vehicle body floor assembly, and the two longitudinal main beams are respectively connected to the side of the left longitudinal beam away from the right longitudinal beam and the side of the right longitudinal beam away from the left longitudinal beam, and both of the longitudinal main beams are provided with multiple vehicle body mounting structures and multiple suspension mounting structures.

[0006] Wherein, the non-load-bearing rear subframe is an integrated cast aluminum structure.

[0007] Among them, the longitudinal main beam frame includes a body mounting portion and a connecting portion, the connecting portion is connected between the body mounting portion and the motor mounting beam frame, the body mounting portion is located on the side of the motor mounting beam frame facing the body floor assembly, and multiple body mounting structures are arranged on the body mounting portion.

[0008] Among them, the vehicle body mounting portion includes a mounting body and a mounting boss, the mounting boss is connected to the middle part of the mounting body and protrudes toward the vehicle body floor assembly, the mounting boss is arranged on the side of the mounting body away from the motor mounting beam, and the multiple vehicle body mounting structures include a first mounting hole extending along the height direction of the vehicle body and a second mounting hole extending along the width direction of the vehicle body, the first mounting hole is arranged on the mounting body, and the second mounting hole is arranged on the mounting boss.

[0009] The installation body has a cavity therein, and a plurality of cross-arranged first reinforcing ribs are provided in the cavity of the installation body.

[0010] The suspension mounting structure includes a shock absorber mounting hole, which is provided on the mounting boss. The mounting boss has a cavity therein, and the cavity of the mounting boss is provided with a second reinforcing rib extending in the height direction of the vehicle body.

[0011] In which, the suspension mounting structure includes a connecting rod mounting hole, the connecting part includes multiple support plates and connecting plates, the two ends of the support plate are respectively connected between the two opposite side surfaces of the vehicle body mounting part and the motor mounting beam frame, at least part of the support plates are provided with the connecting rod mounting hole, and the connecting plate is connected between two adjacent support plates.

[0012] In which, the motor mounting beam also includes a reinforcing crossbeam, which is connected between the left longitudinal beam and the right longitudinal beam. The reinforcing crossbeam includes a straight section and an inclined section connected to both ends of the straight section. The extension direction of the inclined section has an angle with the extension direction of the straight section, and the connecting rod mounting hole is provided on the inclined section.

[0013] Wherein, the left longitudinal beam, the right longitudinal beam, the front cross beam and the rear cross beam are all provided with a plurality of cross-arranged third reinforcing ribs.

[0014] In order to solve the above technical problems, another technical solution adopted in this application is: to provide a chassis assembly, including the non-load-bearing rear subframe, drive motor and rear suspension described in any technical solution, the drive motor is arranged in the motor accommodating space and connected to the motor mounting beam; the rear suspension is arranged on one side of the non-load-bearing rear subframe.

[0015] In order to solve the above technical problems, another technical solution adopted in this application is: providing a vehicle, including a body floor assembly and a chassis assembly described in any technical solution, the body floor assembly including a front cross beam, a rear cross beam and two cross beam connecting plates connected between the front cross beam and the rear cross beam, a rear floor is connected between the two cross beam connecting plates, the two ends of the front cross beam are connected to the door sill beam, and the two ends of the rear cross beam are connected to the energy absorption box; the chassis assembly is arranged on one side of the body floor assembly, and the body floor assembly is detachably connected to the side of the non-load-bearing rear subframe away from the suspension.

[0016] Unlike the prior art, the present invention has the following beneficial effects: the non-load-bearing rear subframe of the present invention integrates a motor mounting beam and a longitudinal main beam. The motor mounting beam is used to mount the drive motor, and the longitudinal main beam is the rear longitudinal beam in the body floor assembly of the related art, which is used to connect to the body floor assembly above. In the present invention, the rear longitudinal beam is separated from the body floor assembly and integrated with the motor mounting beam to form a new non-load-bearing rear subframe. On the one hand, the rear subframe of the present invention, due to the integration of the rear longitudinal beam, can improve the overall strength of the rear subframe, enabling it to better support the body structure above. On the other hand, because the rear longitudinal beam in the body floor assembly is separated, the new body floor assembly formed is mainly sheet metal. When the vehicle model changes, only the body sheet metal parts with a shorter production cycle need to be replaced, while the connection position between the body floor assembly and the non-load-bearing rear subframe remains unchanged. This allows the non-load-bearing rear subframe to be used across different models. That is, different models can share a non-load-bearing rear subframe, which can achieve modular development and rapid model development iteration. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0018] Figure 1 It is a three-dimensional schematic diagram of an embodiment of the non-load-bearing rear subframe of the present application;

[0019] Figure 2 is an exploded view of an embodiment of a vehicle of the present application;

[0020] Figure 3 yes Figure 1 A top view schematic diagram of the non-load-bearing rear subframe shown in FIG;

[0021] Figure 4 This application Figure 1 A side view schematic diagram of a non-load-bearing rear subframe shown in FIG;

[0022] Figure 5 yes Figure 1 A bottom view schematic diagram of the non-load-bearing rear subframe shown in FIG;

[0023] Figure 6 It is a three-dimensional schematic diagram of an embodiment of a vehicle body floor assembly of the present application.

[0024] Figure numbers: 1. Chassis assembly; 10. Non-load-bearing rear subframe; 11. Motor mounting beam; 110. Motor accommodation space; 111. Left longitudinal beam; 112. Right longitudinal beam; 113. Front crossbeam; 114. Rear crossbeam; 115. Reinforced crossbeam; 1151. Straight section; 1152. Inclined section; 116. Motor suspension mounting hole; 117. Third reinforcing rib; 12. Longitudinal main beam; 121. Body mounting portion; 1211. Mounting body; 12111. First reinforcing rib; 12112. Curved plate; 1212. Mounting boss; 12121. Second reinforcing rib; 122. Connecting portion; 1221 , support plate; 1222, connecting plate; 123, first mounting hole; 124, second mounting hole; 125, shock absorber mounting hole; 126, connecting rod mounting hole; 127, air spring mounting part; 20, drive motor; 30, rear suspension; 31, shock absorber; 32, air spring; 33, connecting rod; 331, rear upper link; 332, front upper link; 333, toe link; 334, front lower link; 335, lower arm; 2, body floor assembly; 201, body front cross beam; 202, body rear cross beam; 2021, energy absorption box; 203, cross beam connecting plate; 204, rear floor; 205, door sill beam. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] See also Figure 1-Figure 3 , Figure 1 This is a three-dimensional schematic diagram of an embodiment of the non-load-bearing rear subframe of the present application. Figure 2 is an exploded view of an embodiment of a vehicle of the present application, Figure 3 yes Figure 1 The non-load-bearing rear subframe 10 is arranged at the rear of the vehicle and includes a motor mounting beam 11 and two longitudinal main beams 12.

[0027] The motor mounting beam 11 is used to install the drive motor 20. The motor mounting beam 11 includes a left longitudinal beam 111 and a right longitudinal beam 112 that are spaced apart, and a front cross beam and a rear cross beam connected between the left longitudinal beam 111 and the right longitudinal beam 112. The left longitudinal beam 111, the right longitudinal beam 112, the front cross beam 113 and the rear cross beam 114 together form a motor accommodating space 110 for accommodating the drive motor 20. Specifically, the left longitudinal beam 111 and the right longitudinal beam 112 both extend along the front-to-rear direction of the vehicle body (X direction), the front cross beam 113 and the rear cross beam 114 both extend along the width direction of the vehicle body (Y direction), and the motor mounting beam frame 11 is a frame structure that is overall in the shape of a "mouth". The space within the frame structure is used to install the drive motor 20. A plurality of motor suspension mounting holes 116 are provided on the front cross beam 113, and a motor suspension mounting hole 116 is provided on one end of the left longitudinal beam 111 close to the rear cross beam 114 and one end of the right longitudinal beam 112 close to the rear cross beam 114. The motor suspension mounting hole 116 is used to install the motor suspension, and is flexibly connected to the drive motor 20 through the motor suspension, thereby realizing the connection between the drive motor 20 and the motor mounting beam frame 11.

[0028] The longitudinal main beams 12 are used to connect to the vehicle body floor assembly 2. The two longitudinal main beams 12 are respectively connected to the side of the left longitudinal beam 111 facing away from the right longitudinal beam 112, and the side of the right longitudinal beam 112 facing away from the left longitudinal beam 111. Both longitudinal main beams 12 are provided with multiple body mounting structures and multiple suspension mounting structures (not labeled). Specifically, both longitudinal main beams 12 extend in the front-to-rear direction (X direction) of the vehicle body and are respectively arranged on the outside of the motor mounting beam 11. The body mounting structures are used to connect to the vehicle body floor assembly 2, and the suspension mounting structures are used to connect to the rear suspension 30 at the rear of the vehicle. The multiple suspension mounting structures can specifically include shock absorber mounting structures, air spring mounting structures, and connecting rod mounting structures, etc., which are used to respectively connect to the shock absorber 31, air spring 32, and multiple connecting rods 33 in the rear suspension 30. The suspension mounting structures can be configured according to the type of rear suspension 30, which can be a multi-link suspension, a double wishbone suspension, or other types.

[0029] The non-load-bearing rear subframe 10 of the present application integrates a motor mounting beam 11 and a longitudinal main beam 12. The motor mounting beam 11 is used to mount the drive motor 20, and the longitudinal main beam 12 is the rear longitudinal beam of the vehicle body floor assembly 2 in the related art, which is used to connect to the upper vehicle body floor assembly 2. In the present application, the rear longitudinal beam is separated from the vehicle body floor assembly 2 and integrated with the motor mounting beam 11 to form a new non-load-bearing rear subframe 10. On the one hand, the rear subframe of the present application can improve the overall strength of the rear subframe due to the integration of the rear longitudinal beam of the vehicle body, so that it can better support the upper body structure; on the other hand, since the rear longitudinal beam of the vehicle body in the vehicle body floor assembly 2 is stripped off, the new vehicle body floor assembly 2 formed is mainly sheet metal parts. When the vehicle model changes, it is only necessary to replace some vehicle body sheet metal parts with a shorter production cycle under the premise that the connection position between the vehicle body floor assembly 2 and the non-load-bearing rear subframe 10 remains unchanged, so as to realize the cross-model use of the non-load-bearing rear subframe 10, that is, different vehicle models can share a non-load-bearing rear subframe 10, which can realize modular development and thus achieve rapid iteration of vehicle model development.

[0030] In some embodiments, the non-load-bearing rear subframe 10 is an integrated cast aluminum structure, which can further reduce vehicle weight while ensuring rigidity. The non-load-bearing rear subframe 10 of the present application can be molded in the Z direction (i.e., the height direction of the vehicle body), ensuring overall Z-direction rigidity and cross-sectional force.

[0031] Optionally, Figure 4 This application Figure 1In some embodiments, the longitudinal main beam 12 includes a body mounting portion 121 and a connecting portion 122. The connecting portion 122 is connected between the body mounting portion 121 and the motor mounting beam 11. The body mounting portion 121 is located on the side of the motor mounting beam 11 facing the vehicle body floor assembly 2. Multiple body mounting structures are provided on the body mounting portion 121. Specifically, the body mounting portion 121 extends in the front-to-rear direction (X direction) of the vehicle body. The two ends of the rear cross member 114 extend outside the left longitudinal beam 111 and the right longitudinal beam 112, respectively, and connect to the rear end of the body mounting portion 121. The front end of the body mounting portion 121 connects to the front ends of the left longitudinal beam 111 and the right longitudinal beam 112. The body mounting portion 121 and the motor mounting beam 11 are spaced apart in the vehicle body height direction (Z direction) and in the vehicle body width direction (Y direction). The body mounting portion 121 and the motor mounting beam 11 are connected via an inclined connection portion 122. This arrangement creates an inner and outer frame structure for the non-load-bearing rear subframe 10, with the motor mounting beam 11 serving as the inner frame and the front cross member 113, rear cross member 114, and two body mounting portions 121 forming the outer frame. Portions of the two frame structures are spaced apart in the Z direction, and the inclined connection portion 122 provides the non-load-bearing rear subframe 10 with high strength in both the Z and Y directions.

[0032] Furthermore, the vehicle body mounting portion 121 includes a mounting body 1211 and a mounting boss 1212. The mounting boss 1212 is connected to the middle portion of the mounting body 1211 and protrudes toward the vehicle body floor assembly 2. The mounting boss 1212 is located on the side of the mounting body 1211 facing away from the motor mounting beam 11. Multiple vehicle body mounting structures include a first mounting hole 123 extending along the vehicle body height direction (Z direction) and a second mounting hole 124 extending along the vehicle body width direction (Y direction). The first mounting hole 123 is located on the mounting body 1211, and the second mounting hole 124 is located on the mounting boss 1212. Specifically, the mounting body 1211 extends along the X direction and has an overall upwardly convex arc shape. The mounting boss 1212 protrudes upward and is located in the middle portion of the mounting body 1211 and is located on the outside of the mounting body 1211 along the Y direction. In this embodiment, there are seven first mounting holes 123, two of which are located at the front end of the mounting body 1211. The remaining first mounting holes 123 are arranged along the X-direction on the mounting body 1211. The first mounting holes 123 extend through the mounting body 1211 in the Z-direction as sleeves, allowing for fixed connection to the vehicle body floor assembly 2 above in the Z-direction. The upper surface of the mounting body 1211 supports the vehicle body floor assembly 2. Two second mounting holes 124 are provided, arranged along the X-direction on the mounting boss 1212. The second mounting holes 124 extend through the mounting boss 1212 in the Y-direction as sleeves, allowing for fixed connection to the sides of the vehicle body floor assembly 2 in the Y-direction. This allows for bidirectional fixation to the vehicle body. The connection points between the non-load-bearing rear subframe 10 and the vehicle body floor assembly 2 are the first mounting holes 123 and the second mounting holes 124. The connection between the two is achieved by providing fixings in the first mounting holes 123 and the second mounting holes 124. As long as the positions of the above-mentioned connection points remain unchanged and some vehicle body sheet metal components are changed, the non-load-bearing rear subframe 10 can be used across different vehicle models. That is, different vehicle models can share the same non-load-bearing rear subframe 10, which can achieve modular development and thus achieve rapid iteration of vehicle model development. In other embodiments, the number of first mounting holes 123 and second mounting holes 124 can also be replaced with other numbers.

[0033] In some embodiments, the mounting body 1211 has a cavity therein, and a plurality of cross-arranged first reinforcing ribs 12111 are disposed in the cavity of the mounting body 1211. Specifically, the mounting body 1211 includes two arcuate plates 12112 spaced apart along the Z-direction, forming a cavity between the two arcuate plates 12112, with the cavity opening facing outward. The first reinforcing ribs 12111 within the cavity are arranged in a V-shape and supported between the two arcuate plates 12112, thereby reinforcing the structure of the mounting body 1211.

[0034] In some embodiments, the suspension mounting structure includes a shock absorber mounting hole 125 disposed on a mounting boss 1212. Mounting boss 1212 defines a cavity within which a second reinforcing rib 12121 extending in the vehicle body height direction is disposed. Specifically, shock absorber mounting hole 125 is disposed outside mounting boss 1212 and is used to secure the top of shock absorber 31. The cavity within mounting boss 1212 communicates with the cavity within mounting body 1211. A second reinforcing rib 12121 extending in the Z direction is disposed within the cavity below shock absorber mounting hole 125. This rib supports the mounting boss 1212 below the location of shock absorber mounting hole 125, thereby increasing its strength in the Z direction and ensuring its reliability when subjected to the Z-direction forces exerted by shock absorber 31. Optionally, in this embodiment, the second reinforcing rib 12121 in the vehicle body mounting portion 121 is in the shape of an arc that is concave in the Y direction, so as to achieve thinning in the Y direction, thereby achieving lightweight while reducing casting difficulty.

[0035] In some embodiments, the suspension mounting structure includes a connecting rod mounting hole 126, and the connecting portion 122 includes a plurality of support plates 1221 and a connecting plate 1222. The ends of the support plates 1221 are respectively connected between two opposite sides of the vehicle body mounting portion 121 and the motor mounting beam 11. At least some of the support plates 1221 are provided with connecting rod mounting holes 126, and the connecting plates 1222 are connected between two adjacent support plates 1221. Specifically, the plurality of support plates 1221 connect the vehicle body mounting portion 121 and the motor mounting beam 11 in the Y direction. At the same time, some of the support plates 1221 are hollowed out, so that some connecting rods 33 extend from below the non-load-bearing rear subframe 10 to between the support plates 1221 and connect to the connecting rod mounting holes 126. The remaining support plates 1221 are connected by the connecting plates 1222. The bottom of the connecting plates 1222 can be used to install the remaining connecting rods 33. In this embodiment, the suspension is a five-link suspension system, comprising a rear upper link 331, a front upper link 332, a toe link 333, a front lower link 334, and a lower swing arm 335. Therefore, each connecting portion 122 is provided with five corresponding link mounting holes 126. One end of each of the five links 33 is connected to the connecting portion 122 through the link mounting holes 126. The ends of the rear upper link 331 and the front upper link 332 are connected to the support plate 1221, while the ends of the remaining links 33 are connected to the bottom of the connecting portion 122. In other embodiments, the suspension mounting structure can also be adapted to suit the type of suspension.

[0036] Optionally, see Figure 5 , Figure 5 yes Figure 1 The suspension mounting structure further includes an air spring mounting portion 127 disposed at the bottom of the longitudinal main beam frame 12 for connecting to the top of the air spring 32 .

[0037] Optionally, continue to Figure 5 In some embodiments, the motor mounting beam 11 further includes a reinforcing crossbeam 115, which connects between the left and right longitudinal beams 111 and 112. The reinforcing crossbeam 115 comprises a straight section 1151 and inclined sections 1152 connected at both ends of the straight section 1151. The inclined sections 1152 extend at an angle to the straight section 1151, and the inclined sections 1152 are provided with connecting rod mounting holes 126. Specifically, the reinforcing crossbeam 115 is disposed on the side of the rear crossbeam 114 near the front crossbeam 113, with its ends connecting the left and right longitudinal beams 111 and 112, respectively. The two inclined sections 1152 are shaped like a figure eight, with their openings facing the front crossbeam 113. In this embodiment, the connecting rod mounting holes 126 at each end of the reinforcing crossbeam 115 are used to connect to the lower suspension arm 335. The provision of the two inclined sections 1152 increases both X- and Y-direction strength, improving suspension stiffness and thereby enhancing ride comfort. Furthermore, the reinforcing crossbeam 115 is a trough structure with an opening downward, in which a plurality of cross-arranged, V-shaped third reinforcing ribs 117 are provided, which improves the strength of the motor mounting beam 11 while reducing the weight of the reinforcing crossbeam 115 .

[0038] In some embodiments, the reinforcing crossbeam 115 is integrally cast with other structures of the non-load-bearing rear subframe 10. In other embodiments, the reinforcing crossbeam 115 can also be separately provided with other structures of the non-load-bearing rear subframe 10 and then assembled.

[0039] Optionally, in some embodiments, the left longitudinal beam 111, the right longitudinal beam 112, the front crossbeam 113, and the rear crossbeam 114 are each provided with a plurality of cross-arranged third reinforcing ribs 117. Specifically, the front crossbeam 113, the left longitudinal beam 111, and the right longitudinal beam 112 are each provided with two trough structures distributed along the Z direction, with the openings of the two trough structures facing upward and downward, respectively, i.e., the openings of the two troughs are arranged opposite each other along the Z direction. Each trough structure is provided with a plurality of cross-arranged third reinforcing ribs 117, which can be in a "V" or "X" shape. This improves the strength of the motor mounting beam 11 while reducing the weight of the reinforcing crossbeam 115. The rear crossbeam 114 is a downward-opening trough structure. The trough structure is provided with a plurality of cross-arranged "V"-shaped third reinforcing ribs 117. This improves the strength of the motor mounting beam 11 while reducing the weight of the reinforcing crossbeam 115.

[0040] See Figure 2The present application provides a chassis assembly 1, comprising a non-load-bearing rear subframe 10, a drive motor 20, and a rear suspension 30 according to any of the above embodiments. The drive motor 20 is disposed in a motor accommodation space 110 and connected to a motor mounting beam 11; the rear suspension 30 is disposed on one side of the non-load-bearing rear subframe 10. Specifically, the non-load-bearing rear subframe 10 can be detachably connected to the vehicle body floor assembly 2 by means of a plurality of bolts. In this embodiment, as Figure 2 As shown, the rear suspension 30 is a five-link suspension system, comprising a rear upper link 331, a front upper link 332, a toe link 333, a front lower link 334, and a lower swing arm 335, for a total of five links 33. Accordingly, each connecting portion 122 is also provided with five link mounting holes 126. One end of each of the five links 33 is connected to the connecting portion 122 through the link mounting holes 126. The ends of the rear upper link 331 and the front upper link 332 are connected to the support plate 1221, while the ends of the remaining links 33 are connected to the bottom of the connecting portion 122. In other embodiments, the suspension mounting structure can also be adapted to suit the type of suspension.

[0041] The present application provides a vehicle, comprising a body floor assembly 2 and a chassis assembly 1 of any technical solution, wherein the body floor assembly 2 comprises a front crossbeam 201, a rear crossbeam 202, and two crossbeam connecting plates 203 connected between the front crossbeam 201 and the rear crossbeam 202, a rear floor 204 being connected between the two crossbeam connecting plates 203, a door sill beam 205 being connected at both ends of the front crossbeam 201, and an energy absorption box 2021 being connected at both ends of the rear crossbeam 202; the chassis assembly 1 is arranged on one side of the body floor assembly 2, and the body floor assembly 2 is detachably connected to the side of the non-load-bearing rear subframe 10 facing away from the rear suspension 30.

[0042] See Figure 2 and Figure 6 , Figure 6It is a three-dimensional schematic diagram of an embodiment of the vehicle body floor assembly of the present application. The vehicle body floor assembly 2 includes a vehicle body front cross beam 201 and a vehicle body rear cross beam 202, both of which extend along the vehicle body width direction (Y direction), and the vehicle body front cross beam 201 and the vehicle body rear cross beam 202 are spaced apart along the vehicle body front and rear direction (X direction). Specifically, the vehicle body front cross beam 201 and the vehicle body rear cross beam 202 are both hollow tubular structures, both of which are surrounded by sheet metal parts. Door sill beams 205 are connected to both ends of the vehicle body front cross beam 201, and energy absorption boxes 2021 are connected to both ends of the vehicle body rear cross beam 202. Specifically, the door sill beam 205 is a hollow tubular structure, which is surrounded by sheet metal parts. The two door sill beams 205 are respectively connected to the two ends of the vehicle body front cross beam 201, and the two door sill beams 205 extend forward along the X direction in the direction away from the vehicle body rear cross beam 202. The energy absorption box 2021 is a hollow tubular structure formed by sheet metal parts. The two energy absorption boxes 2021 are respectively connected to the two ends of the rear cross beam 202 of the vehicle body, and the two energy absorption boxes 2021 extend backward along the X direction away from the front cross beam 201 of the vehicle body.

[0043] The vehicle body floor assembly 2 also includes a floor assembly (not shown) connected between the front cross member 201 and the rear cross member 202. This assembly comprises a rear floor 204 and two cross member connecting plates 203 connected on either side of the rear floor 204 along the width of the vehicle body. Specifically, the rear floor 204 and the cross member connecting plates 203 are both sheet metal components. The cross member connecting plates 203 are hot-formed steel sheets. The cross member connecting plates 203 extend in the X-direction, with their front ends connected to the junction of the front cross member 201 and the rocker beam 205, and their rear ends connected to the junction of the rear cross member 202 and the crash box 2021. Along the Y-direction, the inner sides of the cross member connecting plates 203 connect to the rear floor 204, and their outer sides connect to the wheel arches 208. The rear floor 204 is connected to the front cross member 201, the rear cross member 202, and the two cross member connecting plates 203 on all sides.

[0044] The vehicle of the present application separates the rear longitudinal beam of the vehicle body from the vehicle body floor assembly 2 in the related art, and the formed new vehicle body floor assembly 2 is mainly composed of sheet metal parts. When the vehicle model changes, it is only necessary to replace some body sheet metal parts with a shorter production cycle under the premise that the connection position between the vehicle body floor assembly 2 and the non-load-bearing rear subframe 10 remains unchanged, so as to realize the cross-model use of the non-load-bearing rear subframe 10 and the skateboard chassis assembly 1, that is, different vehicle models can share a non-load-bearing rear subframe 10 and skateboard chassis assembly 1, and it is only necessary to replace the upper side body structure of the skateboard chassis assembly 1, which can realize modular development and thus achieve rapid iteration of vehicle model development.

[0045] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A non-load-bearing rear subframe (10), characterized in that: It includes a motor mounting beam (11) and two longitudinal main beams (12); The motor mounting beam (11) is used to mount a drive motor (20), and the motor mounting beam (11) comprises a left longitudinal beam (111), a right longitudinal beam (112) arranged at intervals, and a front crossbeam (113) and a rear crossbeam (114) connected between the left longitudinal beam (111) and the right longitudinal beam (112). The left longitudinal beam (111), the right longitudinal beam (112), the front crossbeam (113), and the rear crossbeam (114) together form a motor accommodating space (110) for accommodating the drive motor (20); The longitudinal main beam frame (12) is used to be connected to the vehicle body floor assembly (2), and the two longitudinal main beam frames (12) are respectively connected to the side of the left longitudinal beam (111) away from the right longitudinal beam (112) and the side of the right longitudinal beam (112) away from the left longitudinal beam (111), and the two longitudinal main beam frames (12) are both provided with a plurality of vehicle body mounting structures and a plurality of suspension mounting structures.

2. The non-load-bearing rear subframe (10) according to claim 1, characterized in that: The non-load-bearing rear subframe (10) is an integrated cast aluminum structure.

3. The non-load-bearing rear subframe (10) according to claim 1, characterized in that: The longitudinal main beam frame (12) includes a vehicle body mounting portion (121) and a connecting portion (122), wherein the connecting portion (122) is connected between the vehicle body mounting portion (121) and the motor mounting beam frame (11), and the vehicle body mounting portion (121) is located on a side of the motor mounting beam frame (11) facing the vehicle body floor assembly (2), and a plurality of vehicle body mounting structures are arranged on the vehicle body mounting portion (121).

4. The non-load-bearing rear subframe (10) according to claim 3, characterized in that: The vehicle body mounting portion (121) includes a mounting body (1211) and a mounting boss (1212), wherein the mounting boss (1212) is connected to the middle of the mounting body (1211) and protrudes toward the vehicle body floor assembly (2), and the mounting boss (1212) is arranged on a side of the mounting body (1211) away from the motor mounting beam (11). The multiple vehicle body mounting structures include a first mounting hole (123) extending in a vehicle body height direction and a second mounting hole (124) extending in a vehicle body width direction, wherein the first mounting hole (123) is arranged on the mounting body (1211), and the second mounting hole (124) is arranged on the mounting boss (1212).

5. The non-load-bearing rear subframe (10) according to claim 4, characterized in that: The mounting body (1211) has a cavity therein, and a plurality of cross-arranged first reinforcing ribs (12111) are provided in the cavity of the mounting body (1211).

6. The non-load-bearing rear subframe (10) according to claim 4, characterized in that: The suspension mounting structure comprises a shock absorber mounting hole (125), wherein the shock absorber mounting hole (125) is arranged on the mounting boss (1212), wherein the mounting boss (1212) has a cavity, and wherein a second reinforcing rib (12121) extending in a vehicle body height direction is provided in the cavity of the mounting boss (1212).

7. The non-load-bearing rear subframe (10) according to claim 3, characterized in that: The suspension mounting structure includes a connecting rod mounting hole (126), the connecting portion (122) includes a plurality of support plates (1221) and a connecting plate (1222), the two ends of the support plate (1221) are respectively connected between two opposite side surfaces of the vehicle body mounting portion (121) and the motor mounting beam (11), at least part of the support plates (1221) are provided with the connecting rod mounting hole (126), and the connecting plate (1222) is connected between two adjacent support plates (1221).

8. The non-load-bearing rear subframe (10) according to claim 7, characterized in that: The motor mounting beam frame (11) further includes a reinforcing crossbeam (115), the reinforcing crossbeam (115) being connected between the left longitudinal beam (111) and the right longitudinal beam (112), the reinforcing crossbeam (115) including a straight section (1151) and inclined sections (1152) connected to both ends of the straight section (1151), the extending direction of the inclined section (1152) and the extending direction of the straight section (1151) forming an included angle, and the connecting rod mounting hole (126) being provided on the inclined section (1152).

9. The non-load-bearing rear subframe (10) according to claim 1, characterized in that: The left longitudinal beam (111), the right longitudinal beam (112), the front cross beam (113) and the rear cross beam (114) are all provided with a plurality of cross-arranged third reinforcing ribs (117).

10. A chassis assembly (1), characterized in that: include: The non-load-bearing rear subframe (10) according to any one of claims 1 to 9; A driving motor (20) is disposed in the motor accommodating space (110) and connected to the motor mounting beam (11); The rear suspension (30) is arranged on one side of the non-load-bearing rear sub-frame (10).

11. A vehicle, characterized in that: include: A vehicle body floor assembly (2), the vehicle body floor assembly (2) comprising a vehicle body front cross beam (201), a vehicle body rear cross beam (202), and two cross beam connecting plates (203) connected between the vehicle body front cross beam (201) and the vehicle body rear cross beam (202), a rear floor (204) connected between the two cross beam connecting plates (203), a door sill beam (205) connected at both ends of the vehicle body front cross beam (201), and an energy absorption box (2021) connected at both ends of the vehicle body rear cross beam (202); The chassis assembly (1) as claimed in claim 10 is arranged on one side of the vehicle body floor assembly (2), and the vehicle body floor assembly (2) is detachably connected to a side of the non-load-bearing rear subframe (10) facing away from the suspension.

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