Multi-link suspension device and vehicle

Abstract

The present invention discloses a multi-link suspension device and a vehicle, wherein the multi-link suspension device comprises: a first link assembly and a second link assembly, both of which are suitable for connection with a vehicle frame, a distance between the first link assembly and a power battery of the vehicle is smaller than a distance between the second link assembly and the power battery, the first link assembly comprises: a first lower link, an angle between the first lower link and a rotation axis of a wheel on which a steering knuckle is mounted is α, and the second link assembly comprises: a second lower link, an angle between the second lower link and the rotation axis is β, and α and β satisfy: α<β. Thus, by cooperating with the first link assembly and the second link assembly, compared with the prior art, the multi-link suspension device can be made compact in the longitudinal structure of the vehicle, and the longitudinal space occupied by the first lower link on the chassis can be reduced, so that more space can be freed up in front of the first lower link to arrange the power battery, thereby improving the vehicle's cruising range.

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and in particular to a multi-link suspension device and a vehicle having the multi-link suspension device. Background Art

[0002] In the related art, the existing multi-link suspension device occupies a large longitudinal space of the chassis, and the space available for arranging the battery under the vehicle is small, resulting in a reduction in the vehicle's cruising range. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a multi-link suspension device, which has a compact structure in the longitudinal direction of the vehicle, can reduce the longitudinal space occupied by the first lower link of the chassis, so that more space can be freed up in front of the first lower link to arrange the power battery, thereby improving the vehicle's cruising range.

[0004] The present invention further provides a vehicle.

[0005] According to the multi-link suspension device of the present invention, the multi-link suspension device is installed between the steering knuckle and the frame of the vehicle, and the multi-link suspension device includes: a first link assembly and a second link assembly, both of which are suitable for connection with the frame, a distance between the first link assembly and the power battery of the vehicle is smaller than a distance between the second link assembly and the power battery, the first link assembly includes: a first lower link, an angle α is included between a projection of the first lower link on a horizontal plane and a projection of a rotation axis of a wheel installed on the steering knuckle on the horizontal plane, and the second link assembly includes: a second lower link, an angle β is included between a projection of the second lower link on the horizontal plane and a projection of the rotation axis on the horizontal plane, and α and β satisfy: α<β.

[0006] According to the multi-link suspension device of the present invention, through the relationship α<β, the first lower link can be brought closer to the rotation axis of the wheel of the steering knuckle, thereby increasing the space in front of the first lower link and reducing the longitudinal space of the chassis occupied by the first lower link, so that more space can be freed up in front of the first lower link to arrange the power battery, thereby improving the vehicle's cruising range.

[0007] In some examples of the present invention, the first link assembly also includes a first upper link, the first lower link having a first lower connection point suitable for connecting to the frame, the first upper link having a first upper connection point suitable for connecting to the frame, and a longitudinal distance between the first upper connection point and the power battery is smaller than a longitudinal distance between the first lower connection point and the power battery.

[0008] In some examples of the present invention, the second link assembly also includes a second upper link, the second upper link having a second upper connection point suitable for connecting to the frame, the second lower link having a second lower connection point suitable for connecting to the frame, and the longitudinal distance between the second upper connection point and the power battery is greater than the longitudinal distance between the second lower connection point and the power battery.

[0009] In some examples of the present invention, the first connecting rod assembly also includes a first upper connecting rod, and the second connecting rod assembly also includes a second upper connecting rod, a projection of the first upper connecting rod on a horizontal plane and a projection of the second upper connecting rod on a horizontal plane intersect at a first upper intersection point, a projection of the first lower connecting rod on a horizontal plane and a projection of the second lower connecting rod on a horizontal plane intersect at a first lower intersection point, the first upper intersection point is located on a side of the rotation axis close to the power battery, and the first lower intersection point is located on a side of the rotation axis away from the power battery.

[0010] In some examples of the present invention, the α satisfies: 11.5°≤α≤15°.

[0011] In some examples of the present invention, the angle between the projection of the second upper connecting rod on the horizontal plane and the projection of the rotation axis on the horizontal plane is δ, and δ satisfies: 29°≤δ≤32°.

[0012] In some examples of the present invention, the first connecting rod assembly further includes a first upper connecting rod, and an angle γ between a projection of the first upper connecting rod on the horizontal plane and a projection of the rotation axis on the horizontal plane is γ, and γ satisfies: 9°≤γ≤14°.

[0013] In some examples of the present invention, the multi-link suspension device is applied to the rear wheels of a vehicle, the first link assembly also includes a first upper link, the second link assembly also includes a second upper link, the first lower link has a first lower connection point suitable for connecting to the frame, the first upper link has a first upper connection point suitable for connecting to the frame, the second upper link has a second upper connection point suitable for connecting to the frame, the second lower link has a second lower connection point suitable for connecting to the frame, the first upper connection point is located in front of the first lower connection point, the second upper connection point is located behind the second lower connection point, and the power battery is located in front of the multi-link suspension device.

[0014] In some examples of the present invention, the first connecting rod assembly further includes a first upper connecting rod, and the second connecting rod assembly further includes a second upper connecting rod, the angle between the projection of the first upper connecting rod on the horizontal plane and the projection of the rotation axis on the horizontal plane is γ, and the angle between the projection of the second upper connecting rod on the horizontal plane and the projection of the rotation axis on the horizontal plane is δ, and γ and δ satisfy: γ<δ.

[0015] In some examples of the present invention, the first lower link has a first lower connection point suitable for connecting to the frame; the second lower link has a second lower connection point suitable for connecting to the frame; the longitudinal distance between the first lower connection point and the second lower connection point is 300mm-450mm.

[0016] In some examples of the present invention, the multi-link suspension device further includes: an adjustment mechanism and a toe adjustment rod, the adjustment mechanism is connected between the steering knuckle and the toe adjustment rod, the toe adjustment rod is connected to the frame, and the adjustment mechanism is used to adjust the toe value of the corresponding wheel.

[0017] In some examples of the present invention, the first connecting rod assembly is located on a side of the rotation axis close to the power battery, and the second connecting rod assembly is located on a side of the rotation axis far from the power battery.

[0018] A vehicle according to the present invention includes the above-mentioned multi-link suspension device.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a schematic diagram of a multi-link suspension device according to an embodiment of the present invention;

[0022] Figure 2 is another angled schematic diagram of a multi-link suspension device according to an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a multi-link suspension device according to an embodiment of the present invention that is not connected to a vehicle frame;

[0024] Figure 4 is an enlarged view of an adjustment mechanism of a multi-link suspension device according to an embodiment of the present invention;

[0025] Figure 5is a top view of a multi-link suspension device according to an embodiment of the present invention;

[0026] Figure 6 is a schematic diagram of assembling a multi-link suspension device with a vehicle frame according to an embodiment of the present invention;

[0027] Figure 7 is a schematic diagram of a virtual kingpin line of a multi-link suspension device according to an embodiment of the present invention;

[0028] Figure 8 is a schematic diagram of a force transmission path between a multi-link suspension device and a vehicle frame according to an embodiment of the present invention;

[0029] Fig. 9 It is a schematic diagram of the assembly of a multi-link suspension device, a vehicle frame and a rear-drive motor assembly according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] A multi-link suspension device 100;

[0032] First connecting rod assembly 10; first upper connecting rod 11; first lower connecting rod 12; first lower connecting point 13; first upper connecting point 14;

[0033] Second connecting rod assembly 20; second upper connecting rod 21; second lower connecting rod 22; second upper connecting point 23; second lower connecting point 24;

[0034] The first upper intersection point M; the first lower intersection point N;

[0035] Adjusting mechanism 50; cam bolt 51; cam gasket 52; locking nut 53; limiting bracket 54;

[0036] Toe adjustment rod 60;

[0037] Steering knuckle 200;

[0038] Frame 300; longitudinal beam 301; cross beam 302;

[0039] Axis of rotation 400 ; rear drive motor assembly 500 ; rear shock absorber 600 ; rear stabilizer bar 700 ; ball joint connecting rod 800 . DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] Reference below Figure 1-Figure 9A multi-link suspension device 100 according to an embodiment of the present invention will be described. The multi-link suspension device 100 may be provided on a vehicle.

[0042] like Figure 1-Figure 9 As shown, according to the multi-link suspension device 100 of the embodiment of the present invention, in the width direction of the vehicle, the multi-link suspension device 100 is installed between the steering knuckle 200 and the frame 300 of the vehicle. It can also be understood that the multi-link suspension device 100 is connected between the steering knuckle 200 and the frame 300. The multi-link suspension device 100 includes: a first link assembly 10 and a second link assembly 20. The first link assembly 10 and the second link assembly 20 are both suitable for connection with the frame 300. The distance between the first link assembly 10 and the power battery of the vehicle is smaller than the distance between the second link assembly 20 and the power battery. It should be noted that in the longitudinal direction of the vehicle (i.e., the front-rear direction of the vehicle), the distance between the first link assembly 10 and the power battery is smaller than the distance between the second link assembly 20 and the power battery. The first link assembly 10 includes: a first upper link 11 and a first lower link 12, as shown in FIG. Figure 5 As shown, the angle between the projection (orthographic projection) of the first lower link 12 on the horizontal plane and the projection (orthographic projection) of the rotation axis 400 of the wheel installed on the steering knuckle 200 on the horizontal plane is α, and the second link assembly 20 includes: a second lower link 22, in the height direction of the vehicle, the angle between the projection (orthographic projection) of the second lower link 22 on the horizontal plane and the projection (orthographic projection) of the rotation axis 400 on the horizontal plane is β, α and β satisfy: α<β, wherein α can satisfy 11.5°≤α≤15°, and β can satisfy: 24°≤β≤27°. In order to obtain better control of longitudinal force toe-in change (the direction of the longitudinal force is the front and rear direction of the vehicle) to ensure the straight-line driving stability of the whole vehicle during braking, and at the same time consider the spare tire arrangement space in the rear luggage compartment, the existing multi-link suspension device usually arranges the first lower link of the multi-link suspension device forward. The angle between the first lower link and the rotation axis of the wheel on which the steering knuckle is installed is large, and the space under the vehicle in front of the first lower link that can accommodate the power battery is small, resulting in a reduced vehicle range.

[0043] In the present application, by setting the angle value of α to be smaller than the angle value of β, the first lower link 12 can be closer to the rotation axis, so that more space can be freed in front of the first lower link 12 to arrange the power battery, so that a power battery with higher energy density can be installed on the vehicle, which can further improve the vehicle's cruising range. In addition, by setting β to: 24°≤β≤27°, the numerical range of β can be made more suitable, the force at the connection between the second lower link 22 and the frame 300 can be within a reasonable range, and the dynamic performance of the multi-link suspension device 100 can be further ensured not to be reduced.

[0044] In addition, compared with the prior art, the angle between the first lower link 12 and the rotation axis 400 of the wheel installed on the steering knuckle 200 becomes smaller, the first lower link 12 is arranged close to the rear of the vehicle, the multi-link suspension device 100 has a compact longitudinal structure in the vehicle, the longitudinal space occupied by the first lower link 12 is reduced, and more space can be freed in front of the first lower link 12 to arrange the power battery, so that a power battery with higher energy density can be installed on the vehicle, thereby improving the vehicle's cruising range.

[0045] Therefore, by cooperating with the first link assembly 10 and the second link assembly 20, compared with the prior art, the multi-link suspension device 100 can be made compact in the longitudinal structure of the vehicle, and the longitudinal space occupied by the first lower link 12 can be reduced, so that more space can be freed up in front of the first lower link 12 to arrange the power battery, thereby improving the vehicle's cruising range.

[0046] In some embodiments of the present invention, α further satisfies: 11.5°≤α≤15°. By setting the minimum value of α to 11.5°, the multi-link suspension device 100 can obtain better longitudinal force toe-in change control, thereby ensuring the straight-line driving stability of the whole vehicle during braking. Moreover, by limiting the maximum value of α, the longitudinal extension length of the first lower link 12 can be limited, thereby ensuring the layout space of the power battery.

[0047] In some embodiments of the present invention, Figure 3 As shown, the first connecting rod assembly 10 may further include a first upper connecting rod 11, a first lower connecting rod 12 having a first lower connecting point 13 suitable for connecting to the vehicle frame 300, the first upper connecting rod 11 having a first upper connecting point 14 suitable for connecting to the vehicle frame 300, the power battery is arranged in front of the first upper connecting point 14, and the longitudinal distance between the first upper connecting point 14 and the power battery is less than the longitudinal distance between the first lower connecting point 13 and the power battery. It should be noted that the longitudinal direction refers to a direction parallel to the longitudinal direction of the vehicle, and the longitudinal direction of the vehicle refers to the front-to-back direction of the vehicle. In the front-to-back direction of the vehicle, such an arrangement enables the first upper connecting point 14 to be located in front of the first lower connecting point 13. It can be understood that the power battery is arranged in front of the first connecting rod assembly 10.

[0048] In some embodiments of the present invention, the multi-link suspension device 100 can be applied to the rear wheels of a vehicle, that is, the multi-link suspension device 100 is installed on the rear wheels of the vehicle, the first link assembly 10 also includes a first upper link 11, the second link assembly 20 also includes a second upper link 21, the first lower link 12 has a first lower connection point 13 suitable for connecting to the frame 300, the first upper link 11 has a first upper connection point 14 suitable for connecting to the frame 300, the second upper link 21 has a second upper connection point 23 suitable for connecting to the frame 300, the second lower link 22 has a second lower connection point 24 suitable for connecting to the frame 300, the first upper connection point 14 is located in front of the first lower connection point 13, the second upper connection point 23 is located behind the second lower connection point 24, and the power battery is located in front of the multi-link suspension device 100. Such an arrangement can make the power battery be arranged in an appropriate position, and can further ensure that the vehicle has good stability when turning. In addition, the distance from the first upper connection point 14 to the front mounting point of the frame 300 and the vehicle body is reduced, and the distance from the second upper connection point 23 to the rear mounting point of the frame 300 and the vehicle body is reduced, which can make the overall force transmission path of the frame 300 better, thereby improving the overall strength and rigidity of the frame 300, and further improving the NVH performance of the vehicle.

[0049] In some embodiments of the present invention, Figure 3 and Figure 7 As shown, the angle between the projection (orthographic projection) of the second upper link 21 on the horizontal plane and the projection (orthographic projection) of the rotation axis 400 of the wheel on which the steering knuckle 200 is installed on the horizontal plane is δ, and δ satisfies: 29°≤δ≤32°. Among them, by setting the angle value of δ to be greater than or equal to 29° and less than or equal to 32°, and setting the second upper connection point 23 behind the first lower connection point 13, and setting the first upper connection point 14 in front of the first lower connection point 13, the distance from the first upper connection point 14 to the front mounting point of the frame 300 and the vehicle body can be reduced, and the distance from the second upper connection point 23 to the rear mounting point of the frame 300 and the vehicle body can also be reduced. The overall force transmission path of the frame 300 is better. When the frame 300 meets the strength requirements, the longitudinal beam 301 of the frame 300 (subframe 300) can be made of a material with a lower yield tensile strength or a thinner thickness. The subframe 300 can achieve a better lightweight effect and reduce costs. Moreover, after the overall force transmission path of the subframe 300 and the connecting rod is improved, the overall stiffness of the frame 300 is also improved, which can effectively improve the NVH performance of the vehicle.

[0050] In some embodiments of the present invention, Figure 3As shown, the first lower link 12 has a first lower connection point 13 suitable for connecting to the frame 300, and the longitudinal distance between the first lower connection point 13 and the rotation axis 400 of the wheel installed with the steering knuckle 200 can be set to 60mm-78mm. It can also be understood that, in the longitudinal direction of the vehicle, the spacing distance between the first lower connection point 13 and the vertical plane where the rotation axis 400 of the wheel installed with the steering knuckle 200 is located is 60mm-78mm. Such a setting can make the force at the connection between the first lower link 12 and the frame 300 within a reasonable range, and can ensure that the dynamic performance of the multi-link suspension device 100 will not be reduced, so that the longitudinal distance between the first lower connection point 13 and the vertical plane where the rotation axis 400 of the wheel installed with the steering knuckle 200 is located can be of appropriate size.

[0051] In some embodiments of the present invention, Figure 3 As shown, the second lower link 22 has a second lower connection point 24 suitable for connecting to the frame 300, and the longitudinal distance between the second lower connection point 24 and the rotation axis 400 of the wheel installed on the steering knuckle 200 is 222mm-390mm, that is, the spacing distance between the second lower connection point 24 and the vertical plane where the rotation axis 400 of the wheel installed on the steering knuckle 200 is located is 222mm-390mm. Such an arrangement can make the force at the connection between the second lower link 22 and the frame 300 within a reasonable range, and can further ensure that the dynamic performance of the multi-link suspension device 100 will not be reduced, so that the spacing distance between the second lower connection point 24 and the vertical plane can be of appropriate size.

[0052] In some embodiments of the present invention, Figure 3 As shown, the first lower link 12 has a first lower connection point 13 suitable for connecting to the frame 300, and the second link assembly 20 may include: a second upper link 21 and a second lower link 22, the second lower link 22 has a second lower connection point 24 suitable for connecting to the frame 300, and the longitudinal distance between the first lower connection point 13 and the second lower connection point 24 is 300mm-450mm, that is, in the front and rear directions of the vehicle, the spacing distance between the first lower connection point 13 and the second lower connection point 24 is 300mm-450mm. This arrangement can make the force at the connection between the first lower link 12, the second lower link 22 and the frame 300 within a reasonable range, which can further ensure that the dynamic performance of the multi-link suspension device 100 will not be reduced.

[0053] In some embodiments of the present invention, Figure 5 and Figure 7As shown, the projection of the first upper link 11 on the horizontal plane and the projection of the second upper link 21 on the horizontal plane intersect at a first upper intersection point M, and the projection of the first lower link 12 on the horizontal plane and the projection of the second lower link 22 on the horizontal plane intersect at a first lower intersection point N. It should be noted that the projection of the extension line of the first upper link 11 on the horizontal plane and the projection of the extension line of the second upper link 21 on the horizontal plane intersect at the first upper intersection point M, and the projection of the extension line of the first lower link 12 on the horizontal plane and the projection of the extension line of the second lower link 22 on the horizontal plane intersect at the first lower intersection point N. The first upper intersection point M is located on the side of the rotation axis 400 close to the power battery, and the first lower intersection point N is located on the side of the rotation axis 400 away from the power battery. Among them, the line connecting the first upper intersection point M and the first lower intersection point N is the virtual kingpin line of the multi-link suspension device 100, and the rear wheels rotate around the virtual kingpin line MN. As shown Figure 6 As shown, when the vehicle turns, for example, when the vehicle turns right, there is a lateral force Fy at the contact point of the tire of the left rear wheel. In order to make the multi-link suspension device 100 have an understeering tendency for the whole vehicle under the lateral force steering condition, the tire needs to be rotated inward when the left rear wheel is subjected to the lateral force Fy. By setting the first upper intersection point M on the side of the rotation axis 400 close to the power battery and the first lower intersection point N on the side of the rotation axis 400 away from the power battery, the virtual kingpin line can be tilted forward, and the tire can be rotated inward when the left rear wheel is subjected to the lateral force Fy, thereby ensuring that the whole vehicle has good stability when turning.

[0054] In some embodiments of the present invention, Figure 7 As shown, in the height direction of the vehicle, the angle between the projection (orthographic projection) of the first upper link 11 on the horizontal plane and the projection (orthographic projection) of the rotation axis 400 on the horizontal plane is γ, and γ satisfies: 9°≤γ≤14°. Among them, by setting the angle between the first upper link 11 and the rotation axis 400 to γ, and setting the first upper connection point 14 to the front side of the first lower connection point 13, it can be ensured that the virtual kingpin line is tilted forward, thereby further ensuring that the whole vehicle has good stability when turning.

[0055] In some embodiments of the present invention, Figure 7As shown, in the height direction of the vehicle, the angle between the projection (orthographic projection) of the first upper link 11 on the horizontal plane and the projection (orthographic projection) of the rotation axis 400 on the horizontal plane is γ, and the angle between the projection (orthographic projection) of the second upper link 21 on the horizontal plane and the projection (orthographic projection) of the rotation axis 400 on the horizontal plane is δ, and γ and δ satisfy: γ<δ, γ satisfies: 9°≤γ≤14°, and δ satisfies: 29°≤δ≤32°, thereby avoiding the virtual kingpin line MN from tilting backward or the virtual kingpin line MN from tilting forward too much. When the virtual kingpin line MN tilts backward, the lateral force compliance steering of the multi-link suspension device 100 causes the vehicle to have an oversteering tendency, and there is a risk of the vehicle skidding when turning, which seriously affects the safety of the occupants. When the virtual kingpin line MN tilts forward at an angle that is too large, the lateral force compliance steering of the multi-link suspension device 100 causes the vehicle to have an excessively large understeering tendency, and the driver needs to constantly correct the steering wheel to ensure that the vehicle turns smoothly, which increases the driver's operating difficulty and driving fatigue, and also affects driving safety. Therefore, by setting the angle value of γ to an angle value that is smaller than δ, and setting the second upper connection point 23 to the rear of the second lower connection point 24, the first upper intersection point M can be made to fall on the following position: Figure 7 Within the target range M1 to M2 shown, the vehicle can avoid tailspinning when turning, and can also avoid the driver from constantly correcting the steering wheel to ensure smooth cornering of the vehicle, thereby simplifying the driver's operating difficulty and driving fatigue, thereby improving the vehicle's driving safety.

[0056] In some embodiments of the present invention, Figure 1 and Figure 4 As shown, the multi-link suspension device 100 may further include: an adjustment mechanism 50 and a toe adjustment rod 60, wherein the adjustment mechanism 50 is connected between the steering knuckle 200 and the toe adjustment rod 60, and the toe adjustment rod 60 is connected to the vehicle frame 300. The adjustment mechanism 50 is used to adjust the toe value of the corresponding wheel. It should be noted that one end of the toe adjustment rod 60 is connected to the vehicle frame 300, and the other end of the toe adjustment rod 60 is connected to the steering knuckle 200 through the adjustment mechanism 50. By rotating the adjustment mechanism 50, the relative position of the toe adjustment rod 60 and the steering knuckle 200 in the width direction of the vehicle can be changed, thereby changing the toe value of the corresponding wheel. The adjustment mechanism 50 is similar to the existing eccentric bolt adjustment structure and adjustment principle, and thus will not be described in detail. By connecting the adjustment mechanism 50 between the steering knuckle 200 and the toe adjustment rod 60, the adjustment space occupied by the operating tool at the connection between the toe adjustment rod 60 and the frame 300 can be reduced, and space for arranging rear-drive motor assemblies 500 of different power sizes can be saved, so that the multi-link suspension device 100 can take into account drive motors of various models and powers, which can meet the ultimate acceleration performance requirements of electric vehicles and has a wide range of applications.

[0057] And, if Figure 4As shown, the adjustment mechanism 50 may include a cam bolt 51, a cam gasket 52 and a non-metallic insert locking nut 53, and a U-shaped limit bracket 54 is provided on the mounting bracket of the toe adjustment rod 60 and the steering knuckle 200, and the limit bracket 54 is used to limit the adjustment mechanism 50 when adjusting the toe.

[0058] It should be noted that the multi-link suspension device 100 of the present application is provided with a rear-drive motor assembly 500, and the rear-drive motor assembly 500 adopts a rear-reverse arrangement, that is, the motor transmission is arranged behind the transmission shaft of the vehicle. The multi-link suspension device 100 of the present application can play the maximum effect with the motor rear-reverse arrangement, that is, the power battery arrangement space is maximized. In addition, the rear-drive motor assembly 500 is fixed on the frame 300 by suspension installation. This arrangement form can reduce the longitudinal space occupied by the first lower link 12 and the frame 300 in front of the rear axle.

[0059] In addition, more regular space can be freed up in front of the first lower link 12 to arrange the power battery, and the longitudinal spacing distance from the rear edge of the power battery to the rotation axis 400 of the rear wheel can be set to 154mm. The rear drive motor assembly 500 of the prior art suspension device adopts a front-down arrangement, that is, the motor transmission is arranged in front of the transmission shaft, so that the longitudinal space occupied by the frame 300 in front of the rear axle increases. At the same time, since the front lower link of the prior art suspension device is arranged forward, too much of the already tight longitudinal space for arranging the power battery is occupied, and the longitudinal distance from the power battery to the rotation axis 400 of the rear wheel is 354mm. Therefore, under the condition of a certain wheelbase of the whole vehicle, the multi-link suspension device 100 of the present application can make the space for arranging the power battery 200mm more in longitudinal length than the prior art suspension device, which can effectively increase the number of power batteries arranged and improve the cruising range of the electric vehicle.

[0060] In some embodiments of the present invention, Figure 3 As shown, the first lower link 12 has a first lower connection point 13 suitable for connecting to the frame 300, and the first upper link 11 has a first upper connection point 14 suitable for connecting to the frame 300. The second upper link 21 has a second upper connection point 23 suitable for connecting to the frame 300, and the second lower link 22 has a second lower connection point 24 suitable for connecting to the frame 300. The first lower connection point 13, the first upper connection point 14, the second lower connection point 24, and the second upper connection point 23 are all suitable for connecting to the longitudinal beam 301 of the frame 300.

[0061] Among them, one end of the first lower link 12 can be connected to the steering knuckle 200 through a rubber bushing on the steering knuckle 200, and the other end of the first lower link 12 can be connected to the frame 300 through a rubber bushing. One end of the second lower link 22 can be connected to the steering knuckle 200 through a ball pin on the steering knuckle 200, and the other end of the second lower link 22 can be connected to the frame 300 through a rubber bushing. One end of the first upper link 11 can be connected to the steering knuckle 200 through a rubber bushing, and the other end of the first upper link 11 can be connected to the frame 300 through a rubber bushing. One end of the second upper link 21 can be connected to the steering knuckle 200 through a rubber bushing, and the other end of the second upper link 21 can be connected to the frame 300 through a rubber bushing. One end of the toe adjustment rod 60 can be connected to the steering knuckle 200 through a rubber bushing on the steering knuckle 200, and the other end of the toe adjustment rod 60 can be connected to the frame 300 through a rubber bushing. The rear shock absorber 600 is a spring and damper integrated structure. The lower end of the rear shock absorber 600 is connected to the steering knuckle 200 through a rubber bushing. The rear shock absorber 600 mainly plays the role of bearing and buffering the impact of the ground. The rear stabilizer bar 700 is arranged to extend laterally along the frame 300. The rear stabilizer bar 700 can be installed and fixed on the frame 300 through a bushing. The two ends of the rear stabilizer bar 700 can be connected to the rear shock absorber 600 through a ball joint 800 to play the role of suppressing the roll of the rear axle.

[0062] In some embodiments of the present invention, Figure 8 As shown, the first connecting rod assembly 10 is located on the side of the rotation axis 400 close to the power battery, and the second connecting rod assembly 20 is located on the side of the rotation axis 400 away from the power battery, that is, the first connecting rod assembly 10 is located on the front side of the rotation axis 400, and the second connecting rod assembly 20 is located on the rear side of the rotation axis 400, wherein the first upper connection point 14 and the first lower connection point 13 are arranged close to the front end of the longitudinal beam 301, and the second upper connection point 23 and the second lower connection point 24 are arranged close to the rear end of the longitudinal beam 301.

[0063] like Figure 8As shown, the first upper connecting rod 11 and the second upper connecting rod 21 transfer the force at the tire to the crossbeam 302 through the longitudinal beam 301 of the frame 300, and then transfer it to the vehicle body through the mounting bushing. The connection point between the first upper connecting rod 11 and the frame 300 is arranged close to the front end of the longitudinal beam 301, the distance from the connection point between the first upper connecting rod 11 and the frame 300 to the front mounting point between the frame 300 and the vehicle body becomes smaller, the force transmission path becomes shorter, and the overall force of the frame 300 is improved. At the same time, after the connection point between the second upper connecting rod 21 and the frame 300 is moved back, the distance from the connection point between the second upper connecting rod 21 and the frame 300 to the rear mounting point between the frame 300 and the vehicle body becomes smaller, the force transmission path becomes shorter, and the overall force of the frame 300 is improved. Therefore, when the frame 300 meets the strength requirements, the longitudinal beam 301 of the frame 300 can be made of a material with a lower yield tensile strength or a thinner thickness, and the frame 300 can achieve a better lightweight effect and reduce costs. After the overall force transmission path of the frame 300 and the multi-link suspension device 100 is improved, the overall rigidity of the frame 300 is also improved, which can effectively improve the NVH performance of the entire vehicle. The multi-link suspension device 100 can make the longitudinal force generated during braking and acceleration and the lateral force during steering pass through the multi-link suspension device 100 in a straight line, and the rigidity of the multi-link suspension device 100 is very good. It should be noted that Figure 8 The arrow in the middle indicates the direction of force transmission.

[0064] The vehicle according to the embodiment of the present invention comprises the multi-link suspension device 100 of the above-mentioned embodiment, and the multi-link suspension device 100 is arranged on the vehicle. The multi-link suspension device 100 can make the multi-link suspension device 100 compact in the longitudinal structure of the vehicle, and can reduce the longitudinal space occupied by the first lower link 12 of the chassis, so that more space can be freed up in front of the first lower link 12 to arrange the power battery, thereby improving the cruising range of the vehicle.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0066] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A multi-link suspension device, characterized in that: The multi-link suspension device is installed between the steering knuckle and the frame of the vehicle, and the multi-link suspension device includes: A first connecting rod assembly and a second connecting rod assembly, both of which are suitable for connection with the vehicle frame, a distance between the first connecting rod assembly and the power battery of the vehicle is smaller than a distance between the second connecting rod assembly and the power battery, the first connecting rod assembly comprises: a first lower connecting rod, an angle α is formed between a projection of the first lower connecting rod on a horizontal plane and a projection of a rotation axis of a wheel mounted on the steering knuckle on the horizontal plane, and the second connecting rod assembly comprises: a second lower connecting rod, an angle β is formed between a projection of the second lower connecting rod on the horizontal plane and a projection of the rotation axis on the horizontal plane, and α and β satisfy: α<β; The first connecting rod assembly further includes a first upper connecting rod, and the second connecting rod assembly further includes a second upper connecting rod, a projection of the first upper connecting rod on a horizontal plane and a projection of the second upper connecting rod on a horizontal plane intersect at a first upper intersection point, a projection of the first lower connecting rod on a horizontal plane and a projection of the second lower connecting rod on a horizontal plane intersect at a first lower intersection point, the first upper intersection point is located on a side of the rotation axis close to the power battery, and the first lower intersection point is located on a side of the rotation axis away from the power battery; The multi-link suspension device is applied to the rear wheels of a vehicle, the first link assembly also includes a first upper link, the second link assembly also includes a second upper link, the first lower link has a first lower connection point suitable for connecting to the frame, the first upper link has a first upper connection point suitable for connecting to the frame, the second upper link has a second upper connection point suitable for connecting to the frame, the second lower link has a second lower connection point suitable for connecting to the frame, the first upper connection point is located in front of the first lower connection point, the second upper connection point is located behind the second lower connection point, and the power battery is located in front of the multi-link suspension device.

2. The multi-link suspension device according to claim 1, characterized in that: The first link assembly also includes a first upper link, the first lower link having a first lower connection point suitable for connecting to the frame, the first upper link having a first upper connection point suitable for connecting to the frame, and a longitudinal distance between the first upper connection point and the power battery is smaller than a longitudinal distance between the first lower connection point and the power battery.

3. The multi-link suspension device according to claim 1, characterized in that: The second link assembly also includes a second upper link, the second upper link has a second upper connection point suitable for connecting to the frame, the second lower link has a second lower connection point suitable for connecting to the frame, and the longitudinal distance between the second upper connection point and the power battery is greater than the longitudinal distance between the second lower connection point and the power battery.

4. The multi-link suspension device according to claim 1, characterized in that: The α satisfies: 11.5°≤α≤15°.

5. The multi-link suspension device according to claim 1, characterized in that: An angle between a projection of the second upper connecting rod on the horizontal plane and a projection of the rotation axis on the horizontal plane is δ, and δ satisfies: 29°≤δ≤32°.

6. The multi-link suspension device according to claim 1, characterized in that: The first connecting rod assembly further includes a first upper connecting rod, and an angle γ is formed between a projection of the first upper connecting rod on the horizontal plane and a projection of the rotation axis on the horizontal plane, and γ satisfies: 9°≤γ≤14°.

7. The multi-link suspension device according to claim 1, characterized in that: The first connecting rod assembly also includes a first upper connecting rod, and the second connecting rod assembly also includes a second upper connecting rod. The angle between the projection of the first upper connecting rod on the horizontal plane and the projection of the rotation axis on the horizontal plane is γ, and the angle between the projection of the second upper connecting rod on the horizontal plane and the projection of the rotation axis on the horizontal plane is δ, and γ and δ satisfy: γ<δ.

8. The multi-link suspension device according to claim 1, characterized in that: The first lower connecting rod has a first lower connecting point suitable for connecting to the frame; the second lower connecting rod has a second lower connecting point suitable for connecting to the frame; the longitudinal distance between the first lower connecting point and the second lower connecting point is 300mm-450mm.

9. The multi-link suspension device according to claim 1, characterized in that: The multi-link suspension device further comprises: an adjustment mechanism and a toe adjustment rod, wherein the adjustment mechanism is connected between the steering knuckle and the toe adjustment rod, the toe adjustment rod is connected to the vehicle frame, and the adjustment mechanism is used to adjust the toe value of the corresponding wheel.

10. The multi-link suspension device according to claim 1, characterized in that: The first connecting rod assembly is located on a side of the rotation axis close to the power battery, and the second connecting rod assembly is located on a side of the rotation axis far from the power battery.

11. A vehicle, characterized in that: It comprises a multi-link suspension device according to any one of claims 1-10.

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