Novel active suspension system

Abstract

The utility model belongs to the technical field of suspensions, and particularly relates to a novel active suspension system which comprises a suspension assembly, the suspension assembly comprises a variable cross-section plate spring, a transmission assembly, an upper swing arm and a lower swing arm, the cross sections of the two ends of the variable cross-section plate spring are oval, and the axial cross section of the variable cross-section plate spring gradually increases from one end to the other end. One end of the upper swing arm and one end of the lower swing arm are connected with wheels through hub connecting pieces, the other end of the upper swing arm and the other end of the lower swing arm are hinged to a vehicle frame, the lower swing arm is provided with the ball pair installation base, the ball pair installation base is connected with the small oval end of the variable cross-section plate spring through an adapting ball head, and the transmission assembly is installed on the vehicle frame. The transmission assembly is connected with the large oval end of the variable cross-section plate spring so that the variable cross-section plate spring can rotate, the lower swing arm is hinged to one end of the active damper, and the other end of the active damper is hinged to the vehicle frame. The large oval end of the variable cross-section plate spring serves as the main bearing end, the small oval end is connected through the adapter ball head to prevent jamming, and the stability and comfort of the vehicle are further improved through the active damper.

Description

Technical Field

[0001] This utility model relates to the field of suspension technology, specifically to a novel active suspension system. Background Technology

[0002] Traditional vehicle suspensions primarily employ passive suspension structures, whose stiffness and damping parameters are determined during the vehicle design phase and cannot be dynamically adjusted according to actual driving conditions. This design often struggles to balance handling and comfort when facing complex and varied road conditions. For example, at high speeds or during emergency lane changes, a softer suspension system may lead to excessive body roll, affecting vehicle stability; while on bumpy roads or at low speeds, a stiffer suspension system can reduce ride comfort and may even damage the vehicle's structure.

[0003] With the rapid development of the automotive industry, especially the widespread adoption of intelligent driving and electrification technologies, consumers are increasingly demanding higher vehicle performance. Active suspension systems, as a technology capable of dynamically adjusting suspension parameters, have gradually become a research hotspot.

[0004] The applicant's previous application CN114435050A disclosed an active suspension, system, and control method, which changed the shaft diameter of the buffer rod by rotating it, thereby providing different elastic feedback forces; however, after multiple uses, it was found that the suspension system was insufficient in improving the stability and comfort of the vehicle and needs further improvement. Utility Model Content

[0005] To address the aforementioned problems, this invention provides a novel active suspension system with a simple structure that, while achieving dynamic adjustment of stiffness, further improves vehicle comfort and stability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a novel active suspension system, comprising a suspension assembly, the suspension assembly including a variable cross-section leaf spring, a transmission component, an upper control arm, and a lower control arm. The variable cross-section leaf spring has elliptical cross-sections at both ends, and its axial cross-section increases from one end to the other. One end of the upper control arm and the lower control arm is connected to the wheel via a wheel hub connector, and the other end of the upper control arm and the lower control arm is hinged to the vehicle frame. A ball joint mounting seat is installed on the lower control arm, and the ball joint mounting seat is connected to the small elliptical end of the variable cross-section leaf spring via an adapter ball joint. The transmission component is installed on the vehicle frame and is connected to the large elliptical end of the variable cross-section leaf spring to allow the variable cross-section leaf spring to rotate. One end of the lower control arm is hinged to an active damper, and the other end of the active damper is hinged to the vehicle frame.

[0007] Furthermore, the transmission assembly includes a mounting base plate, on which a bearing seat and a motor mounting seat are provided. The reducer is fixed on the motor mounting seat and driven by the motor. A bearing is sleeved on the outer wall of the adapter shaft, and the bearing is located inside the bearing seat. The large elliptical end of the variable cross-section leaf spring is connected to one end of the adapter shaft. The adapter shaft and the reducer are connected by gear transmission.

[0008] Furthermore, the internal shape of the adapter shaft is consistent with the shape of the large elliptical end of the variable cross-section leaf spring.

[0009] Furthermore, the output shaft of the reducer is connected to the driving gear, the other end of the adapter shaft is connected to the driven gear, and a first end cover for limiting the driving gear is provided on the output shaft of the reducer, and a second end cover for limiting the driven gear is provided on the adapter shaft.

[0010] Furthermore, an installation interface is provided between the adapter ball head and the ball joint mounting seat. The adapter ball head is divided into a ball head and a bushing part, which are integrally formed. The installation interface is connected to the ball head and the ball joint mounting seat respectively. The small elliptical end of the variable cross-section leaf spring is connected to the bushing part, and the internal shape of the bushing part is consistent with the shape of the small elliptical end of the variable cross-section leaf spring.

[0011] Furthermore, the active damper is any one of an electromagnetic damper, a hydraulic damper, or a pneumatic damper.

[0012] Furthermore, the variable cross-section leaf spring is made of carbon fiber composite material.

[0013] Furthermore, it also includes a sensor device for monitoring the vehicle's driving status, a pre-aiming device for monitoring road surface information, and a controller. The sensor device and the pre-aiming device are both connected to the controller, which is also electrically connected to the transmission assembly.

[0014] Furthermore, the sensor device includes an accelerometer sensor, an angle sensor, a stiffness travel sensor, and a tire pressure sensor.

[0015] Furthermore, the aiming device includes a forward-facing camera and a lidar.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model adopts a variable cross-section leaf spring, and its axial cross-section transitions from a small ellipse to a large ellipse. The large elliptical end is connected to the frame through a transmission component as the main load-bearing end, while the small elliptical end is connected to the wheel and requires a certain degree of flexible floating. Therefore, an adapter ball joint is used to avoid jamming. At the same time, an active damper is used to adjust the damping parameters according to road conditions, further improving the stability and comfort of the vehicle.

[0018] 2. By introducing sensor devices and pre-aiming devices to monitor the vehicle's driving status and road conditions, the information is transmitted to the controller in real time. The controller then controls the transmission components to drive the variable cross-section leaf spring to rotate and adjust the stiffness, effectively improving the response speed of the suspension system and the comfort and stability of the vehicle. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the installation state of the active suspension of the present invention;

[0021] Figure 2 This is a schematic diagram of the connection state of the variable cross-section leaf spring of the present invention;

[0022] Figure 3 This is an exploded view of the connection state of the variable cross-section leaf spring of the present invention;

[0023] Figure 4 This is a schematic diagram of the overall structure of the active suspension of the present invention;

[0024] Figure 5 The transient dynamic simulation diagram is used to verify the installation structure of the variable cross-section leaf spring.

[0025] Figure 6 The diagram illustrates the analysis of the angle and vertical deformation of the variable cross-section leaf spring as demonstrated in the experiment.

[0026] Figure 7 The experimental verification diagram shows the relationship between the angle and maximum stress of the variable cross-section leaf spring.

[0027] Figure 8 The experimental verification is based on the relationship between the angle and output torque of the variable cross-section leaf spring.

[0028] In the diagram: 1. Variable cross-section leaf spring; 2. Upper control arm; 3. Lower control arm; 4. Hub connector; 5. Wheel; 6. Frame; 7. Ball joint mounting seat; 8. Adapter ball head; 9. Active damper; 10. Mounting base plate; 11. Bearing housing; 12. Motor mounting seat; 13. Reducer; 14. Motor; 15. Adapter shaft; 16. Bearing; 17. Drive gear; 18. Driven gear; 19. First end cover; 20. Second end cover; 21. Controller; 22. Mounting interface; 801. Ball head; 802. Bushing. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0030] The terms "first," "second," etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects, not to describe a specific order or sequence. Even if "second" is used before a technical feature for distinction, it does not necessarily imply the presence of "first." It should be understood that in this utility model, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. It should be understood that in this utility model, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, and Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Containing X, Y, and Z," "Containing X, Y, and Z" means that all three X, Y, and Z are included; "Containing X, Y, or Z" means that one of X, Y, and Z is included; "Containing X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are included.

[0031] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be selected to be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0032] Example 1

[0033] like Figures 1 to 4 As shown, this utility model provides a novel active suspension system, including a suspension assembly. The suspension assembly includes a variable cross-section leaf spring 1, a transmission assembly, an upper control arm 2, and a lower control arm 3. The variable cross-section leaf spring 1 has elliptical cross-sections at both ends, and its axial cross-section increases from one end to the other. One end of the upper control arm 2 and the lower control arm 3 is connected to a wheel 5 via a wheel hub connector 4, and the other end of the upper control arm 2 and the lower control arm 3 is hinged to a vehicle frame 6. A ball joint mounting seat 7 is installed on the lower control arm 3, and the ball joint mounting seat 7 is connected to the small elliptical end of the variable cross-section leaf spring 1 via an adapter ball joint 8. The transmission assembly is installed on the vehicle frame 6 and is connected to the large elliptical end of the variable cross-section leaf spring 1 to allow the variable cross-section leaf spring 1 to rotate. One end of the lower control arm 3 is hinged to an active damper 9, and the other end of the active damper 9 is hinged to the vehicle frame 6.

[0034] The variable cross-section leaf spring 1 is connected to the lower control arm 3 and the transmission assembly respectively. The transmission assembly drives the variable cross-section leaf spring 1 to rotate, causing its stiffness in the vertical direction to change, thereby realizing the active adjustment of the suspension system. The cross-section of the variable cross-section leaf spring 1 smoothly transitions from a small ellipse to a large ellipse, and the stiffness changes rapidly and the change stroke is large during rotation. The large elliptical end is connected to the transmission assembly as the main load-bearing end and is set on the frame 6. The end of the variable cross-section leaf spring 1 connected to the wheel 5 needs a certain degree of flexible floating, while the small elliptical end has better elasticity and is connected by an adapter ball joint 8. The ball joint connection can realize multi-degree-of-freedom movement, bear multi-directional loads, and improve the stability of movement. At the same time, the active damper 9 adjusts the damping parameters according to the road conditions to further improve the stability and comfort of the vehicle.

[0035] Specifically, the transmission assembly includes a mounting base plate 10, on which a bearing seat 11 and a motor mounting seat 12 are mounted. A reducer 13 is fixed to the motor mounting seat 12 and driven by a motor 14. A bearing 16 is sleeved on the outer wall of a transition shaft 15, and the bearing 16 is located inside the bearing seat 11. The large elliptical end of the variable cross-section leaf spring 1 is connected to one end of the transition shaft 15, and the transition shaft 15 and the reducer 13 are connected via gear transmission. The motor 14 drives the reducer 13 to rotate, and the gear transmission drives the transition shaft 15 and the variable cross-section leaf spring 1 to rotate, thereby achieving vertical stiffness adjustment. The internal shape of the transition shaft 15 is consistent with the shape of the large elliptical end of the variable cross-section leaf spring 1, and the variable cross-section leaf spring 1 is easily connected to the transition shaft 15 by a plug-in connection. The output shaft of the reducer 13 is connected to the drive gear 17, and the other end of the adapter shaft 15 is connected to the driven gear 18. The output shaft of the reducer 13 is provided with a small end cover 19 for limiting the drive gear 17, and the adapter shaft 15 is provided with a large end cover 20 for limiting the driven gear 18. The large end cover 20 on the adapter shaft 15 is used to limit the driven gear 18. By setting the large end cover 20 and the small end cover 19, the axial limiting of the driven gear 18 and the drive gear 17 is achieved, reducing the risk of tooth disengagement and ensuring the stability and safety of the transmission.

[0036] Specifically, the active damper 9 is any one of an electromagnetic damper, a hydraulic damper, or a pneumatic damper.

[0037] Furthermore, an installation interface 22 is provided between the adapter ball head 8 and the ball joint mounting base 7. The adapter ball head 8 is divided into a ball head 801 and a bushing part 802, which are integrally formed. The installation interface 22 is connected to the ball head 801 and the ball joint mounting base 7 respectively. The small elliptical end of the variable cross-section leaf spring 1 is connected to the bushing part 802, and the internal shape of the bushing part 802 is consistent with the shape of the small elliptical end of the variable cross-section leaf spring 1. The adapter ball head 8 can provide multiple degrees of freedom of movement, allowing the variable cross-section leaf spring 1 to flexibly adjust its position and direction. Moreover, through the rotation and swing of the ball head, the stress at the connection can be dispersed, stress concentration can be reduced, and the strength and life of the connection can be improved. The bushing part is designed to have an internal shape consistent with the shape of the small elliptical end of the variable cross-section leaf spring 4, so that the variable cross-section leaf spring 4 and the adapter ball head 11 can be inserted and fixed, which facilitates the installation and disassembly of the variable cross-section leaf spring 4.

[0038] Furthermore, the variable cross-section leaf spring 1 is made of carbon fiber composite material. Carbon fiber composite material has the advantages of high strength and high toughness, which can enhance the load-bearing capacity of the variable cross-section leaf spring 1 and increase the amount of stroke variation.

[0039] Example 2

[0040] The active suspension system also includes a sensor device for monitoring the vehicle's driving status, a pre-aiming device for monitoring road surface information, and a controller 21. The sensor device and the pre-aiming device are both connected to the controller 21, which is also electrically connected to the transmission assembly. The sensor device includes an accelerometer sensor, a steering angle sensor, a stiffness and travel sensor, and a tire pressure sensor. The pre-aiming device includes a forward-aiming camera and a lidar.

[0041] When the vehicle is in motion, the sensor device and the aiming device collect vehicle driving status data and road condition data respectively and transmit them to the controller 21. The controller 21 calculates the required suspension stiffness according to a preset algorithm based on the collected data and sends a command to the transmission component, which drives the variable cross-section leaf spring 1 to rotate, thereby adjusting the stiffness. For example, when driving at high speed, the transmission component rotates the variable cross-section leaf spring 1 to a higher stiffness position to improve vehicle stability; when driving on bumpy roads, it rotates to a lower stiffness position to improve comfort.

[0042] Experiments have shown that:

[0043] Transient dynamic simulation of the variable cross-section leaf spring 1 installation structure in Implementation 1 was performed using finite element software. The effective length of the variable cross-section leaf spring 1 was set to 500mm, the cross-sectional dimensions of the small elliptical end were 35mm×17mm, and the cross-sectional dimensions of the large elliptical end were 50mm×25mm. A vertical force of 5000N was applied to the large elliptical end of the variable cross-section leaf spring 1. The specific screenshot from the finite element software is shown below. Figure 5As shown, the rotation angle of the variable cross-section leaf spring 1 was gradually changed, and the relevant simulation analysis data in Table 1 below were obtained: (To ensure stability, numbers 1-27 represent the preload stage, where the angle of the variable cross-section leaf spring 1 is 0°, and the mechanism is in its initial state with minimum stiffness; after loading a vertical external force of 5000N, the angle of the variable cross-section leaf spring 1 was rotated starting from number 28 to change the overall stiffness of the mechanism)

[0044] Table 1. Transient dynamic analysis results

[0045] Serial Number Leaf spring angle (°) Vertical deformation (mm) Maximum stress value (MPa) Torque at driven gear 18 (N·M) 1 0 7.54 128.77 -0.14501 2 0 16.29 223.52 -0.13667 3 0 21.04 291.35 -0.12936 4 0 24.84 344.31 -0.1264 5 0 27.70 383.18 -0.12056 6 0 28.86 395.58 -0.1206 7 0 30.33 412.67 -0.11656 8 0 34.48 469.28 -0.11127 9 0 39.77 544.08 -0.1016 10 0 45.08 619.97 -0.092673 11 0 49.71 685.25 -0.080937 12 0 52.98 730.53 -0.073888 13 0 54.62 750.79 -0.067591 14 0 55.73 762.45 -0.064724 15 0 58.75 802.6 -0.05691 16 0 63.95 876.14 -0.04146 17 0 69.13 950.25 -0.024228 18 0 74.01 1020 -0.0069691 19 0 77.69 1071.7 0.0069882 20 0 79.75 1099.4 0.015975 21 0 80.77 1109.7 0.021063 22 0 82.91 1137.1 0.029167 23 0 87.71 1205.2 0.048926 24 0 92.81 1278.7 0.072815 25 0 97.80 1351 0.097008 26 0 101.66 1406.2 0.11718 27 0 104.06 1439.8 0.13114 28 0.2218 104.98 1453.9 6.5235 29 1.7178 105.16 1486.9 48.911 30 2.8428 105.10 1509.5 65.029 31 3.9678 104.73 1525.2 114.18 32 5.0928 103.91 1534.5 115.24 33 6.2178 102.63 1534.7 167.28 34 7.3428 101.00 1528.1 160.55 35 8.4678 99.19 1518.4 206.75 36 9.5928 97.42 1506.7 198.38 37 10.718 95.77 1497.7 237.71 38 11.843 94.26 1488.6 231.37 39 12.968 92.74 1479.5 263.31 40 14.093 91.04 1475.4 257.33 41 15.218 89.03 1470 278.69 42 16.343 86.69 1456.8 269.31 43 17.468 84.15 1437.8 280.04 44 18.593 81.64 1417.3 269.18 45 19.718 79.35 1399 275.28 46 20.843 77.38 1385 267.48 47 21.968 75.62 1373.8 272.45 48 23.093 73.89 1361.4 265.81 49 24.218 71.97 1343.7 265.74 50 25.343 69.78 1318.9 255.05 51 26.468 67.43 1292.8 248.68 52 27.593 65.16 1278.4 236.51 53 28.718 63.19 1268.1 230.57 54 29.843 61.60 1263.9 222.65 55 30.968 60.24 1263 219.29 56 32.093 58.85 1259.6 212.31 57 33.218 57.22 1248.7 205.55 58 34.343 55.36 1229.9 194.59 59 35.468 53.47 1208.7 185.07 60 36.593 51.86 1192.1 175.73 61 37.718 50.64 1183.9 169.91 62 38.843 49.69 1181.1 164.76 63 39.968 48.71 1176 159.95 64 41.093 47.45 1162.5 152.69 65 42.218 45.96 1141.2 144.21 66 43.343 44.52 1119.4 135.45 67 44.468 43.40 1105.3 128.95 68 45.593 42.66 1100.7 124.33 69 46.718 42.05 1098.7 120.66 70 47.843 41.24 1090.1 115.59 71 48.968 40.14 1071.9 109.17 72 50.093 38.95 1050.1 102.28 73 51.218 38.02 1034.7 96.508 74 52.343 37.47 1029.8 92.727 75 53.468 37.09 1029.5 89.872 76 54.593 36.53 1023.2 86.101 77 55.718 35.68 1006.9 81.423 78 56.843 34.73 986.65 75.469 79 57.968 34.03 973.49 71.472 80 59.093 33.69 970.88 68.595 81 60.218 33.47 971.49 65.688 82 61.343 33.03 964.95 62.931 83 62.468 32.32 948.57 58.23 84 63.593 31.59 931.2 54.078 85 64.718 31.16 922.79 50.987 86 65.843 31.02 923.59 48.797 87 66.968 30.88 923.74 46.643 88 68.093 30.47 914.51 43.609 89 69.218 29.86 898.36 40.591 90 70.343 29.37 885.88 37.459 91 71.468 29.21 883.65 35.265 92 72.593 29.22 886.33 33.392 93 73.718 29.05 883.15 30.686 94 74.843 28.63 870.83 27.9 95 75.968 28.18 857.3 25.615 96 77.093 27.98 851.9 23.327 97 78.218 28.04 854.4 21.035 98 79.343 28.05 855.44 19.597 99 80.468 27.82 847.54 16.852 100 81.593 27.45 834.93 14.477 101 82.718 27.25 827.55 12.9 102 83.843 27.32 828.69 10.483 103 84.968 27.45 831.74 8.7272 104 86.093 27.39 827.99 7.1311 105 87.218 27.14 817.57 5.0775 106 88.343 26.95 809.03 3.0133 107 89.468 27.02 808.45 0.60684 108 90.593 27.24 816.87 -0.902 109 91.718 27.33 821.22 -2.9122 110 92.843 27.21 818.38 -4.8943 111 93.968 27.07 814.61 -6.7579 112 95.093 27.14 817.39 -8.8842 113 96.218 27.41 826.06 -11.029 114 97.343 27.63 833.06 -13.31 115 98.468 27.66 833.27 -15.319 116 99.593 27.60 830.3 -17.293 117 100.72 27.69 831.64 -19.352 118 101.84 27.98 839.62 -22.167 119 102.97 28.32 848.54 -24.176 120 104.09 28.51 852.2 -26.403 121 105.22 28.57 851 -28.439 122 106.34 28.68 851.4 -30.944 123 107.47 29.00 857.87 -33.507 124 108.59 29.43 867.8 -35.89 125 109.72 29.80 874.96 -38.773 126 110.84 30.01 876.68 -41.065 127 111.97 30.19 877.07 -43.846 128 113.09 30.52 881.65 -46.529 129 114.22 31.02 891.29 -49.846 130 115.34 31.56 901.25 -52.893 131 116.47 31.97 906.96 -56.021 132 117.59 32.29 908.94 -58.873 133 118.72 32.65 911.98 -62.175 134 119.84 33.19 919.66 -65.376 135 120.97 33.87 930.71 -69.823 136 122.09 34.52 940.49 -74.093 137 123.22 35.06 948.18 -77.701 138 124.34 35.54 954.91 -81.311 139 125.47 36.11 963.6 -85.013 140 126.59 36.86 976.72 -89.747 141 127.72 37.72 992.3 -94.48 142 128.84 38.56 1006.7 -100.1 143 129.97 39.30 1017.5 -104.73 144 131.09 40.01 1026.4 -109.17 145 132.22 40.81 1037 -114.04 146 133.34 41.77 1051.3 -119.73 147 134.47 42.87 1068.2 -126.27 148 135.59 43.98 1084.4 -132.77 149 136.72 45.02 1097.8 -138.91 150 137.84 46.02 1108.9 -144.56 151 138.97 47.08 1120.3 -150.51 152 140.09 48.28 1134.4 -157.23 153 141.22 49.65 1151.3 -164.82 154 142.34 51.09 1168.8 -172.93 155 143.47 52.54 1184.7 -180.74 156 144.59 53.93 1197.9 -187.98 157 145.72 55.32 1209.5 -194.85 158 146.84 56.80 1221.4 -201.94 159 147.97 58.42 1235.2 -209.72 160 149.09 60.20 1250.6 -218.12 161 150.22 62.07 1266 -226.66 162 151.34 63.94 1279.6 -234.72 163 152.47 65.78 1290.4 -241.93 164 153.59 67.61 1298.7 -248.29 165 154.72 69.48 1305.9 -254.14 166 155.84 71.45 1312.9 -259.85 167 156.97 73.56 1320.3 -265.44 168 158.09 75.76 1327 -270.57 169 159.22 78.00 1331.9 -274.64 170 160.34 80.20 1333.6 -277.07 171 161.47 82.33 1339.1 -277.5 172 162.59 84.39 1346.2 -275.94 173 163.72 86.43 1350.8 -272.54 174 164.84 88.47 1353.7 -267.55 175 165.97 90.54 1355.2 -260.97 176 167.09 92.62 1354.7 -252.53 177 168.22 94.64 1351.5 -241.91 178 169.34 96.54 1345.7 -228.74 179 170.47 98.26 1359.5 -212.8 180 171.59 99.78 1369.5 -194.22 181 172.72 101.09 1375.7 -173.24 182 173.84 102.24 1378.6 -150.17 183 174.97 103.24 1378.7 -125.39 184 176.09 104.11 1376.2 -99.095 185 177.22 104.83 1397.2 -71.24 186 178.34 105.37 1425.5 -42.842 187 179.47 105.68 1450 -13.539 188 180 105.72 1460.1 0.25873

[0046] Based on the above data, plot the relationships between the variable cross-section leaf spring angle and vertical deformation, the variable cross-section leaf spring angle and maximum stress, and the variable cross-section leaf spring angle and output torque. See the diagram below for details. Figures 6 to 8 As shown;

[0047] From Table 1 and Figures 5 to 8 As shown, under a vertical external force of 5000N, by changing the rotation angle of the variable cross-section leaf spring 1, the maximum deformation of the large elliptical end of the variable cross-section leaf spring 1 is 105.16mm, the minimum deformation is 26.95mm, and the change stroke reaches 78.21mm. The change stroke meets the suspension travel requirements of most conventional vehicles. Moreover, the maximum stiffness of the variable cross-section leaf spring 1 is 3.9 times the minimum stiffness, which can achieve a stiffness change range of 3.9 times. The maximum stress is 1534.7MPa. The tensile strength of the commonly used carbon fiber composite material T300 is 3530MPa. The maximum stress is within the strength range of carbon fiber composite materials and has sufficient margin. The maximum holding torque required at the driven gear 18 is 280.04N·m. The power can be matched according to this torque value. In summary, the variable cross-section leaf spring 1 is theoretically feasible, structurally reasonable, and can achieve all design indicators and functions.

[0048] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.

Claims

1. A novel active suspension system, comprising a suspension assembly, characterized in that, The suspension assembly includes a variable cross-section leaf spring (1), a transmission assembly, an upper control arm (2), and a lower control arm (3). The cross-sections of both ends of the variable cross-section leaf spring (1) are elliptical, and its axial cross-section increases from one end to the other. One end of the upper control arm (2) and the lower control arm (3) is connected to the wheel (5) through a hub connector (4), and the other end of the upper control arm (2) and the lower control arm (3) is hinged to the frame (6). A ball joint mounting seat (7) is installed on the lower control arm (3), and the ball joint mounting seat (7) is connected to the small elliptical end of the variable cross-section leaf spring (1) through an adapter ball head (8). The transmission assembly is installed on the frame (6) and is connected to the large elliptical end of the variable cross-section leaf spring (1) to make the variable cross-section leaf spring (1) rotate. One end of the lower control arm (3) is hinged to the active damper (9), and the other end of the active damper (9) is hinged to the frame (6).

2. The novel active suspension system according to claim 1, characterized in that, The transmission assembly includes a mounting base plate (10), on which a bearing seat (11) and a motor mounting seat (12) are provided. The reducer (13) is fixed on the motor mounting seat (12) and driven by the motor (14). A bearing (16) is sleeved on the outer wall of the adapter shaft (15). The bearing (16) is located inside the bearing seat (11). The large elliptical end of the variable cross section leaf spring (1) is connected to one end of the adapter shaft (15). The adapter shaft (15) and the reducer (13) are connected by gear transmission.

3. A novel active suspension system according to claim 2, characterized in that, The internal shape of the adapter shaft (15) is consistent with the shape of the large elliptical end of the variable cross-section leaf spring (1).

4. A novel active suspension system according to claim 2, characterized in that, The output shaft of the reducer (13) is connected to the drive gear (17), and the other end of the adapter shaft (15) is connected to the driven gear (18). A first end cover (19) for limiting the drive gear (17) is provided on the output shaft of the reducer (13), and a second end cover (20) for limiting the driven gear (18) is provided on the adapter shaft (15).

5. A novel active suspension system according to claim 1, characterized in that, An installation interface (22) is provided between the adapter ball head (8) and the ball joint mounting seat (7). The adapter ball head (8) is divided into a ball head (801) and a bushing (802). The ball head (801) and the bushing (802) are integrally formed. The installation interface (22) is connected to the ball head (801) and the ball joint mounting seat (7) respectively. The small elliptical end of the variable cross-section leaf spring (1) is connected to the bushing (802). The internal shape of the bushing (802) is consistent with the shape of the small elliptical end of the variable cross-section leaf spring (1).

6. A novel active suspension system according to claim 1, characterized in that, The active damper (9) is any one of an electromagnetic damper, a hydraulic damper, or a pneumatic damper.

7. A novel active suspension system according to claim 1, characterized in that, The variable cross-section leaf spring (1) is made of carbon fiber composite material.

8. A novel active suspension system according to claim 1, characterized in that, It also includes a sensor device for monitoring the vehicle's driving status, a pre-aiming device for monitoring road information, and a controller (21), wherein the sensor device and the pre-aiming device are both connected to the controller (21), and the controller (21) is also electrically connected to the transmission assembly.

9. A novel active suspension system according to claim 8, characterized in that, The sensor device includes an accelerometer sensor, an angle sensor, a stiffness and travel sensor, and a tire pressure sensor.

10. A novel active suspension system according to claim 8, characterized in that, The aiming device includes a forward-looking camera and a lidar.

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