Lower vehicle body framework and vehicle

Abstract

The utility model provides a lower vehicle body framework and a vehicle. The lower vehicle body framework comprises multi-connecting-rod suspensions, a rear motor assembly, a rear auxiliary frame and a flat floor, the multi-connecting-rod suspensions and the rear motor assembly are both connected with the rear auxiliary frame, the multi-connecting-rod suspensions are arranged on the two sides of the rear auxiliary frame, and the rear auxiliary frame is assembled to the bottom of the flat floor. The height of the topmost end of the multi-connecting-rod suspension is not larger than that of the topmost end of the rear motor assembly. According to the lower vehicle body framework and the vehicle, the space of a passenger compartment can be increased, and the riding comfort is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a lower vehicle body structure and a vehicle. Background Art

[0002] The modern automotive industry has put forward higher and higher performance requirements for the vehicle's suspension system. For models equipped with rear-drive motors, multi-link suspension systems are usually used to achieve high load-bearing capacity and excellent handling. The multi-link suspension system can better control the movement trajectory of the wheels through the rational configuration of multiple links such as upper and lower control arms and cross arms, thereby improving the stability, comfort and handling of the vehicle.

[0003] However, the multi-link suspension structure is relatively complex and requires a large space. Especially when the multi-link suspension is placed in conjunction with the rear-drive motor, it is often necessary to partially raise the body floor to avoid it, which to some extent affects the interior space and the height of the vehicle.

[0004] Therefore, it is necessary to provide an improved lower vehicle body structure and a vehicle to solve the above problems. Utility Model Content

[0005] The present application provides a lower body structure and a vehicle that increase the passenger compartment space and improve ride comfort.

[0006] The present application discloses a lower vehicle body structure, comprising a multi-link suspension, a rear motor assembly, a rear subframe and a flat floor, wherein the multi-link suspension and the rear motor assembly are both connected to the rear subframe, the multi-link suspension is arranged on both sides of the rear subframe, and the rear subframe is assembled to the bottom of the flat floor; the height of the top end of the multi-link suspension is not higher than the height of the top end of the rear motor assembly.

[0007] Furthermore, the multi-link suspension includes an upper control arm, a lower swing arm, a toe rod and a steering knuckle. The upper control arm, the lower swing arm and the toe rod are all connected to the steering knuckle at one end and connected to the rear subframe at the other end.

[0008] Furthermore, the height of the top end of the upper control arm is not higher than the height of the top end of the rear motor assembly, and the height of the bottom end of the lower swing arm is not lower than the height of the bottom end of the rear motor assembly.

[0009] Further, the upper control arm includes a first upper control arm and a second upper control arm, and the front toe rod is located between the first upper control arm and the lower swing arm.

[0010] Furthermore, the rear motor assembly includes a rear drive motor and a pair of drive shafts, and two ends of the drive shaft are respectively connected to the rear drive motor and the steering knuckle.

[0011] Furthermore, it also includes a body frame, which includes a pair of body longitudinal beams and a pair of body cross beams connecting the pair of body longitudinal beams. The pair of body longitudinal beams and the pair of body cross beams form a rectangular frame. The upper surfaces of the rectangular frame are all located at the same horizontal height, and the flat floor is fixed above the rectangular frame.

[0012] Furthermore, a mounting portion is provided on the rear subframe, and the mounting portion is fixed to the vehicle body frame via fasteners.

[0013] Furthermore, the rectangular frame and the flat floor together form a recessed portion, the top ends of the multi-link suspension and the rear motor assembly are higher than the mounting portion, the top ends of the multi-link suspension and the rear motor assembly extend into the recessed portion, and the height of the multi-link suspension and the rear motor assembly above the mounting portion is not greater than the depth of the recessed portion.

[0014] Furthermore, the overall height of the multi-link suspension is not greater than the overall height of the rear motor assembly.

[0015] The present application also discloses a vehicle, comprising the lower vehicle body structure as described above.

[0016] The lower body structure and vehicle of the present application integrate the multi-link suspension and the rear motor assembly on the rear subframe, and the rear subframe is assembled to the bottom of the flat floor. The overall structure is compact, avoiding the waste of space caused by the scattered layout. At the same time, by making the top of the multi-link suspension no higher than the top of the rear motor assembly, the space occupied by the multi-link suspension, the rear motor assembly and the rear subframe can be further reduced, better adapted to the flat floor, and the overall space layout is optimized, and the passenger compartment space is increased to improve the riding experience.

[0017] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0019] Figure 1 It is a three-dimensional view of the lower vehicle body structure of the present application when it is not fully assembled.

[0020] Figure 2 It is a stereoscopic diagram of the rear suspension unit, rear motor assembly and rear subframe of the present application after assembly.

[0021] Figure 3 yes Figure 2 Front view of .

[0022] Figure 4 It is a bottom view of the flat floor of the vehicle body structure under this application.

[0023] Figure 5 It is a three-dimensional diagram of the flat floor of the vehicle body structure under this application.

[0024] Description of the accompanying drawings: 10, rear suspension unit; 11, upper control arm; 111, first upper control arm; 112, second upper control arm; 12, lower swing arm; 13, front toe rod; 14, steering knuckle; 15, wheel hub bearing; 20, rear motor assembly; 21, rear drive motor; 22, drive shaft; 30, rear subframe; 31, main body; 32, mounting portion; 33, first connecting portion; 34, second connecting portion; 40, flat floor; 41, recessed portion; 50, body frame; 51, body longitudinal beam; 52, body cross beam; DETAILED DESCRIPTION

[0025] Here, the technical solutions in the embodiments (or "implementations") of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0026] If there are terms involving directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance.

[0027] Next, the embodiments of the specification are described in detail. In the present application, the direction of the front of the vehicle is the front, the direction of the rear of the vehicle is the rear, and the width direction of the vehicle is the left-right direction.

[0028] like Figures 1 to 5 As shown, the present application provides a lower vehicle body structure, including a multi-link suspension 10, a rear motor assembly 20, a rear subframe 30, a flat floor 40 and a vehicle body frame 50. The multi-link suspension 10 and the rear motor assembly 20 are both connected to the rear subframe 30. The rear subframe 30 is assembled to the bottom of the flat floor 40. The flat floor 40 is fixed to the vehicle body frame 50.

[0029] Please also refer to Figure 2 and Figure 3The multi-link suspension 10 includes two suspension units, which are respectively arranged on the left and right sides of the rear subframe 30 and have the same structure. The following description will be made by taking the structure of the suspension unit on one side as an example.

[0030] Each suspension unit includes an upper control arm 11, a lower swing arm 12, a toe rod 13, a steering knuckle 14, and a wheel hub bearing 15. The upper control arm 11, the lower swing arm 12, and the toe rod 13 are connected to the steering knuckle 14 at one end, and connected to the rear subframe 30 at the other end. The steering knuckle 14 is connected to the wheel hub bearing 15 at one end away from the rear subframe 30, and is connected to the wheel through the wheel hub bearing 15.

[0031] The upper control arm 11 is located at the top of the multi-link suspension 10, and its two ends are respectively connected to the steering knuckle 14 and the rear subframe 30. Through the up and down movement of the upper control arm 11, the vertical displacement of the wheel can be controlled, the road vibration can be absorbed, and the comfort of the vehicle can be improved. At the same time, the upper control arm 11 can also adjust the toe angle, affecting the straight-line stability and steering response of the vehicle. In the present application, the upper control arm 11 includes a first upper control arm 111 arranged relatively forward and a second upper control arm 112 arranged relatively backward.

[0032] The lower arm 12 is located at the bottom of the multi-link suspension 10, and its two ends are respectively connected to the steering knuckle 14 and the rear subframe 30. The movement of the lower arm 12 can adjust the load distribution of the wheel, relieve the pressure of the tire, and reduce the wear of the tire. At the same time, the design of the lower arm will also affect the damping characteristics of the multi-link suspension 10, and further affect the steering response and driving experience of the vehicle.

[0033] The two ends of the toe rod 13 are connected to the steering knuckle 14 and the rear subframe 30 respectively. The toe rod 13 is used to adjust the angle between the wheels, so that the two wheels along the width direction of the vehicle are in a state of tilting outward (outward toe) or tilting inward (inward toe), affecting the straight-line stability of the vehicle, thereby improving driving comfort, reducing tire wear, and increasing the service life of the tire. Along the height direction of the vehicle body, the toe rod 13 is located between the first upper control arm 111 and the lower swing arm 12, so that the multi-link suspension 10 is more concentrated in the height of the vehicle body, the structure is compact, and the space occupied by the multi-link suspension 10 can be reduced.

[0034] It is understandable that this embodiment only shows an exemplary structure of the multi-link suspension 10. In actual situations, the internal components of the multi-link suspension 10 and the connection relationship between the components can be flexibly designed as needed.

[0035] The rear motor assembly 20 includes a rear drive motor 21 and a pair of drive shafts 22. The rear drive motor 21 is fixed in the middle of the subframe 30 and is used to drive the vehicle. The pair of drive shafts 22 are respectively located on both sides of the rear drive motor 21, and the two ends of the drive shaft 22 are respectively connected to the rear drive motor 21 and the steering knuckle 14, so that the power output by the rear drive motor 21 is transmitted to the wheel through the steering knuckle 14 and the wheel hub bearing 15.

[0036] The rear subframe 30 includes a main body 31, a mounting portion 32, a first connection portion 33, and a second connection portion 34 provided on the main body 31. The mounting portion 32 and the vehicle body frame 50 are fixed by fasteners, so that the rear subframe 30 is fixed to the vehicle body frame 50. The upper control arm 11 and the first connection portion 33 are connected by fasteners, so that the upper control arm 11 is connected to the rear subframe 30. The front toe rod 13 and the second connection portion 34 are connected by fasteners, so that the front toe rod 13 is connected to the rear subframe 30.

[0037] The top of the multi-link suspension 10 and the rear motor assembly 20 are higher than the mounting portion 32. Specifically, there are four mounting portions 32, which are located at the four corners of the main body 31, which can better disperse and transfer the various loads generated by the vehicle during driving and reduce the overload risk of a single connection point. The heights of the four mounting portions 32 are consistent and are basically the same as the height of the main body 31, making the connection between the rear subframe 30 and the body frame 50 more stable and reliable.

[0038] There are four first connection parts 33, which are located on both sides of the main body 31, corresponding to the first upper control arm 111 and the second upper control arm 112 on both sides. From the side close to the main body 31 to the side away from the main body 31, the first connection parts 33 are gradually tilted upward, so that the height of the connection between the upper control arm 11 and the first connection parts 33 is higher than the height of the mounting part 32. The upper part of the drive motor 21 extends out of the main body 31, so that the top end of the rear motor assembly 20 is higher than the mounting part 32.

[0039] There are two second connection parts 34, which are located on both sides of the main body 31. The height of the second connection parts 34 is substantially the same as that of the main body 31. The fasteners of the present application are all bolts.

[0040] Please also refer to Figure 4 and Figure 5 , a flat floor 40 is arranged at the bottom of the vehicle's passenger compartment. In the front-to-back direction, the flat floor 40 runs through the entire passenger compartment, and the height remains unchanged. The second and third row passenger seats can be installed above the flat floor 40, and long seat slide rails can be laid to achieve common rail linkage of the passenger compartment seats. The lower body structure of the present application improves the space utilization of the vehicle in the height direction by setting the flat floor 40, and makes the interior space design more flexible and changeable.

[0041] The vehicle body frame 50 includes a pair of vehicle body longitudinal beams 51 and a pair of vehicle body cross beams 52. The two ends of the vehicle body cross beam 52 are respectively connected to the pair of vehicle body longitudinal beams 51. The pair of vehicle body longitudinal beams 51 and the pair of vehicle body cross beams 52 form a rectangular frame, the upper surfaces of which are all at the same level, and the flat floor 40 is fixed above the rectangular frame.

[0042] In the present application, the rear subframe 30 is fixed to the vehicle body longitudinal beam 51 and the vehicle body cross beam 52 through the mounting portion 32. In some cases, the connection between the rear subframe 30 and the vehicle body can be flexibly set, such as setting a mounting bracket on the vehicle body frame 50 to connect with the rear subframe 30, or the rear subframe 30 is directly fixed to the flat floor 40, etc., and the present application does not limit this.

[0043] It is understandable that the vehicle body longitudinal beam 51 and the vehicle body cross beam 52 both have a certain height. Therefore, the rectangular frame and the flat floor 40 together form a recessed portion 41, and the recessed portion 41 is located at the bottom of the flat floor 40. When the rear subframe 30 is assembled to the bottom of the flat floor 40, the mounting portion 32 is substantially level with the vehicle body longitudinal beam 51 and the vehicle body cross beam 52 in height, and the top of the multi-link suspension 10 and the rear motor assembly 20 extends into the recessed portion 41. In order to avoid interference between the multi-link suspension 10 and the rear motor assembly 20 and the flat floor 40, the height of the multi-link suspension 10 and the rear motor assembly 20 above the mounting portion 32 is not greater than the depth of the recessed portion 41.

[0044] In the present application, the overall structure of the multi-link suspension 10, the rear motor assembly 20 and the rear subframe 30 is compact. The height of the top of the multi-link suspension 10 is not higher than the height of the top of the rear motor assembly 20, so that the multi-link suspension 10 and the rear motor assembly 20 occupy a small space in the height direction, reducing the overall size of the components below the flat floor 40, so that the flat floor 40 can be set as low as possible, and the passenger compartment space above the flat floor 40 is increased.

[0045] Furthermore, the height of the top end of the upper control arm 11 is not higher than the height of the top end of the rear motor assembly 20, and the height of the bottom end of the lower swing arm 12 is not lower than the height of the bottom end of the rear motor assembly 20. The overall height of the multi-link suspension 10 is not greater than the overall height of the rear motor assembly 20, so as to further make the structure of the multi-link suspension 10 compact and reduce the occupied space.

[0046] The lower body structure and vehicle of the present application are integrated by setting the multi-link suspension 10 and the rear motor assembly 20 on the rear subframe 30, and the rear subframe 30 is assembled to the bottom of the flat floor 40. The overall structure is compact, avoiding the waste of space caused by the scattered arrangement. At the same time, by making the top of the multi-link suspension 10 not higher than the top of the rear motor assembly 20, the space occupied by the multi-link suspension 10, the rear motor assembly 20 and the rear subframe 30 can be further reduced, better adapted to the flat floor 40, and the overall space layout is optimized, and the passenger compartment space is increased to improve the riding experience.

[0047] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without causing conflicts. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A lower vehicle body structure, characterized in that: The vehicle comprises a multi-link suspension, a rear motor assembly, a rear subframe and a flat floor, wherein the multi-link suspension and the rear motor assembly are both connected to the rear subframe, the multi-link suspension is arranged on both sides of the rear subframe, and the rear subframe is assembled to the bottom of the flat floor; the height of the top end of the multi-link suspension is not higher than the height of the top end of the rear motor assembly.

2. The lower vehicle body structure according to claim 1, characterized in that: The multi-link suspension comprises an upper control arm, a lower swing arm, a toe rod and a steering knuckle. One end of the upper control arm, the lower swing arm and the toe rod are connected to the steering knuckle, and the other end is connected to the rear subframe.

3. The lower vehicle body structure according to claim 2, characterized in that: The height of the top end of the upper control arm is not higher than the height of the top end of the rear motor assembly, and the height of the bottom end of the lower swing arm is not lower than the height of the bottom end of the rear motor assembly.

4. The lower vehicle body structure according to claim 2, characterized in that: The upper control arm includes a first upper control arm and a second upper control arm, and the front toe rod is located between the first upper control arm and the lower swing arm.

5. The lower vehicle body structure according to claim 2, characterized in that: The rear motor assembly includes a rear drive motor and a pair of drive shafts, and two ends of the drive shaft are respectively connected to the rear drive motor and the steering knuckle.

6. The lower vehicle body structure according to claim 1, characterized in that: It also includes a body frame, which includes a pair of body longitudinal beams and a pair of body cross beams connecting the pair of body longitudinal beams. The pair of body longitudinal beams and the pair of body cross beams form a rectangular frame. The upper surfaces of the rectangular frame are all located at the same horizontal height, and the flat floor is fixed above the rectangular frame.

7. The lower vehicle body structure according to claim 6, characterized in that: The rear subframe is provided with a mounting portion, and the mounting portion is fixed to the vehicle body frame by fasteners.

8. The lower vehicle body structure according to claim 7, characterized in that: The rectangular frame and the flat floor together form a recessed portion, the top ends of the multi-link suspension and the rear motor assembly are higher than the mounting portion, the top ends of the multi-link suspension and the rear motor assembly extend into the recessed portion, and the height of the multi-link suspension and the rear motor assembly above the mounting portion is not greater than the depth of the recessed portion.

9. The lower vehicle body structure according to claim 1, characterized in that: The overall height of the multi-link suspension is no greater than the overall height of the rear motor assembly.

10. A vehicle, characterized in that: It comprises the lower vehicle body structure as claimed in any one of claims 1 to 9.

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