Plate spring suspension system of electric vehicle

Abstract

The electric vehicle plate spring suspension system comprises a vehicle body, and the bottom of the vehicle body comprises a chassis frame, rear wheels and a plate spring suspension; a rear axle of the rear wheel is matched with the chassis frame through a plate spring suspension; the plate spring suspension comprises a plate spring frame, a downward-protruding-arc-shaped plate spring assembly is arranged on the lower side of the plate spring frame, and the rear axle is located below the middle of the plate spring assembly and connected with the lower side of the middle of the upper plate spring assembly through a detachable connecting assembly. An inclined wheel shaft jumping restraining swing rod is arranged on the front lower portion of the plate spring assembly, and in the initial state, the inclined wheel shaft jumping restraining swing rod is in the posture of being high in front and low in rear; the front end of the axle run-out restraint swing rod is hinged to the chassis frame through a hinge a; the rear end of the axle run-out restraint swing rod is hinged to the rear axle through a hinge b; and the bounce consistency of the rear wheels is improved, and the vehicle control performance is improved.

Description

Technical Field

[0001] The present invention belongs to the field of vehicle chassis. Background Art

[0002] Leaf spring suspensions have the advantages of simple structure, low cost, strong load-bearing capacity, etc., and are widely used in the suspension structures of various vehicles. Since the leaf spring is an elastic component with non-rigid constraints, under different bumpy road conditions, the leaf spring will not only undergo normal deformations in the up and down directions due to longitudinal loads, but also undergo corresponding elastic deformations due to the pulsed component forces in the front and rear directions received by the rear wheels. As a result, the rear wheels will cause relative offsets in the front and rear directions between the rear wheels and the vehicle frame in addition to the normal up and down displacements due to the component forces in the front and rear directions. Furthermore, the jumping trajectories of the rear wheels relative to the vehicle frame under different road conditions are inconsistent, which cannot give the driver a consistent feedback, thus reducing the controllability of the vehicle; moreover, the stiffness of the leaf spring changes non-linearly with the increase of the load, with the problem of being too soft when unloaded and too hard when fully loaded, making the vehicle prone to jolting when unloaded and the suspension being too stiff when fully loaded. Summary of the Invention

[0003] Object of the Invention: In order to overcome the deficiencies in the prior art, the present invention provides an electric vehicle leaf spring suspension system to improve the consistency of rear wheel jumping and the vehicle handling performance.

[0004] Technical Solution: To achieve the above object, an electric vehicle leaf spring suspension system of the present invention includes a vehicle body, and the bottom of the vehicle body includes a chassis frame, a rear wheel, and a leaf spring suspension; the rear wheel axle of the rear wheel cooperates with the chassis frame through the leaf spring suspension;

[0005] The leaf spring suspension includes a leaf spring frame, and a leaf spring assembly with a downward convex arc shape is arranged on the lower side of the leaf spring frame. The rear wheel axle is below the middle of the leaf spring assembly, and the rear wheel axle is connected to the lower side of the middle of the upper leaf spring assembly through a detachable connection assembly;

[0006] An obliquely arranged wheel axle jumping constraint swing rod is arranged in front of and below the leaf spring assembly. In the initial state, the obliquely arranged wheel axle jumping constraint swing rod is in a posture of being higher at the front and lower at the rear; the front end of the wheel axle jumping constraint swing rod is hinged to the chassis frame through a hinge a, and the rear end of the wheel axle jumping constraint swing rod is hinged to the rear wheel axle through a hinge b.

[0007] Furthermore, front supports and rear supports are respectively fixed to the lower sides of the front and rear parts of the leaf spring frame, and the two ends of the leaf spring assembly are respectively connected to the front support and the rear support through inclined front connecting arms and rear connecting arms.

[0008] Furthermore, the upper end of the front connecting arm is fixedly connected to the front support, and the lower end of the front connecting arm is rotatably connected to the upper front end of the leaf spring assembly; the upper end of the rear connecting arm is hinged to the rear support through a hinge c, and the lower end of the rear connecting arm is rotatably connected to the rear end of the leaf spring assembly.

[0009] Furthermore, the leaf spring frame is fixedly connected to the chassis frame.

[0010] Furthermore, the leaf spring frame is integrally formed by a floating guide rail beam, a front plunger cylinder and a rear plunger cylinder, the floating guide rail beam extends in the front-rear direction, a guide rail extending in the front-rear direction is arranged on one side of the floating guide rail beam, a slider is arranged in the guide rail, and one side of the slider is fixedly connected to the chassis frame through an inner connecting block; the front support and the rear support are respectively integrally arranged at the lower sides of the front plunger cylinder and the rear plunger cylinder;

[0011] The upper end of the rear connecting arm is fixedly connected to the rear support, and the lower end of the rear connecting arm is rotatably connected to the rear end of the leaf spring assembly; the upper end of the front connecting arm is hinged to the front support through a D hinge, and the lower end of the front connecting arm is rotatably connected to the front end of the leaf spring assembly.

[0012] Furthermore, the front plunger barrel and the rear plunger barrel are respectively on the front and rear sides of the connecting block, and the front plunger barrel and the rear plunger barrel both extend in the front-to-back direction, and one side of the front plunger barrel and the rear plunger barrel are fixedly connected to the floating guide rail beam; the ends of the front plunger barrel and the rear plunger barrel that are away from each other are closed;

[0013] A front hydraulic piston and a rear hydraulic piston are respectively arranged in the front plunger cylinder and the rear plunger cylinder; the sides of the front plunger cylinder and the rear plunger cylinder that are away from each other form a front hydraulic column cavity and a rear hydraulic column cavity respectively; the ends of the front hydraulic piston and the rear hydraulic piston that are close to each other are fixedly connected to the connecting block through the front piston rod and the rear piston rod respectively;

[0014] A liquid exchange channel is provided inside the integrated structure composed of the front hydraulic piston, the front piston rod, the connecting block, the rear piston rod and the rear hydraulic piston along the length direction, and the front hydraulic column cavity and the rear hydraulic column cavity are connected to each other through the liquid exchange channel.

[0015] Furthermore, a conical flow control valve core is coaxially arranged within the rear end of the liquid exchange channel, with the thin end of the conical flow control valve core facing forward and the thick end facing backward, and the rear end of the conical flow control valve core is fixedly connected to the rear end integrated cover of the rear plunger cylinder.

[0016] Furthermore, when the vehicle body is in a stable unloaded state, an annular flow limiting gap is formed between the outer peripheral wall of the conical cylindrical flow control valve core and the inner wall of the rear end of the liquid exchange channel; when the conical cylindrical flow control valve core moves backward relative to the rear hydraulic piston, the gap width of the annular flow limiting gap gradually increases.

[0017] Beneficial effect: When the rear wheel bounces up and down due to bumps, the leaf spring assembly of the present invention provides bounce resistance and buffering, and the axle bounce constraint rocker arm adaptively swings up and down around hinge a under the bouncing action of the rear wheel. Conversely, the axle bounce constraint rocker arm strictly constrains the bouncing trajectory of the rear wheel and the rear wheel axle during the up and down swinging of the axle bounce constraint rocker arm around hinge a, so that the bouncing trajectory of the rear wheel under any working condition is consistent, thereby improving the consistency of the rear wheel bounce and improving the vehicle handling performance.

[0018] Meanwhile, the second embodiment not only solves the problem of abnormal deformation of the leaf spring assembly, but also improves the problems of being too soft under no-load and too hard under full-load. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of the vehicle body;

[0020] Figure 2 is a front view of the vehicle body;

[0021] Figure 3 is a schematic diagram of the three-dimensional structure of the suspension of the first embodiment;

[0022] Figure 4 is a front view of the suspension of the first embodiment;

[0023] Figure 5 is Figure 4 a schematic diagram of the structure after hiding the rear wheels on the basis of;

[0024] Figure 6 is a front view of the suspension of the second embodiment;

[0025] Figure 7 is a perspective view of the suspension of the second embodiment;

[0026] Figure 8 is Figure 7 a three-dimensional sectional view of. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] As shown in the attached Figures 1 to 8 figures, an electric vehicle leaf spring suspension system is applied to a four-wheel electric vehicle or an electric car. The basic structure includes a vehicle body 1. The bottom of the vehicle body 1 includes a chassis frame 4, rear wheels 2, and a leaf spring suspension. The rear axle 8 of the rear wheels 2 is matched with the chassis frame 4 through the leaf spring suspension. The leaf spring suspension includes a leaf spring frame 11. A leaf spring assembly 6 with a downward convex arc shape is arranged on the lower side of the leaf spring frame 11. The rear axle 8 is below the middle of the leaf spring assembly 6, and the rear axle 8 is connected to the lower side of the middle of the upper leaf spring assembly 6 through a detachable connection assembly 9. The rear wheels 2 are rotationally matched with the rear axle 8. This solution can adopt a front-wheel drive scheme, and the rear wheels do not provide power.

[0029] Since the leaf spring assembly 6 is an elastic component with non-rigid constraints, under different bumpy road conditions, the rear wheels will be subjected to pulsed component forces in the front-rear direction. The rear wheels will cause a relative offset in the front-rear direction between the rear wheels and the vehicle frame due to the component forces in the front-rear direction. As a result, the jumping trajectories of the rear wheels 2 relative to the vehicle frame under different road conditions are inconsistent, and it is impossible to give the driver a consistent feedback, thereby reducing the controllability of the vehicle. To optimize this problem, the following optimization solutions are provided:

[0030] Below the front of the leaf spring assembly 6 of this solution, there is an obliquely arranged wheel axle bounce restraint swing rod 3. In the initial state, the obliquely arranged wheel axle bounce restraint swing rod 3 is in a posture with the front end higher than the rear end. The front end of the wheel axle bounce restraint swing rod 3 is hinged to the chassis frame 4 through a hinge 5, and the rear end of the wheel axle bounce restraint swing rod 3 is hinged to the rear wheel axle 8 through a hinge 7. The front support 12 and the rear support 13 are respectively fixed to the lower sides of the front and rear parts of the leaf spring frame 11. The two ends of the leaf spring assembly 6 are respectively connected to the front support 12 and the rear support 13 through the inclined front connecting arm 10 and the rear connecting arm 14. When the rear wheel 2 bounces up and down due to bumps, the leaf spring assembly 6 provides bounce resistance and buffering, and the wheel axle bounce restraint swing rod 3 swings up and down around the hinge 5 adaptively under the action of the bounce of the rear wheel 2. In turn, during the process of the wheel axle bounce restraint swing rod 3 swinging up and down around the hinge 5, it strictly restricts the bounce trajectory of the rear wheel 2 and the rear wheel axle 8, so that the bounce trajectory of the rear wheel under any working conditions is kept consistent, thereby improving the consistency of the rear wheel bounce and improving the vehicle handling performance.

[0031] The leaf spring assembly 6 includes two types: "normal elastic deformation" and "abnormal elastic deformation". In the case of "normal elastic deformation", the leaf spring assembly 6 undergoes a deformation with a uniformly increasing or decreasing radius of curvature. The two symmetric parts of the front and rear of the leaf spring assembly 6 are symmetrically deformed, the stress changes at each part of the leaf spring assembly 6 are uniform, and the two sides of the leaf spring assembly 6 contract and expand symmetrically; otherwise, it is "abnormal elastic deformation". During the process of the wheel axle bounce restraint swing rod 3 strictly restricting the bounce trajectory of the rear wheel 2 and the rear wheel axle 8, it will force the lowermost end of the leaf spring assembly 6 to strictly follow the swing path displacement of the wheel axle bounce restraint swing rod 3, which is likely to cause the problem of "abnormal elastic deformation" of the leaf spring assembly 6. Its non-coincident trajectory needs to be bridged by the unconventional deformation of the leaf spring assembly 6, thus affecting the life of the leaf spring. Therefore, on the basis of the above structure, the following two further optimized embodiments are provided below.

[0032] The first embodiment (as Figure 3 , 4 , 5):

[0033] The upper end of the front connecting arm 10 is fixedly connected to the front support 12, and the lower end of the front connecting arm 10 is rotatably connected to the front upper end of the leaf spring assembly 6. The upper end of the rear connecting arm 14 is hinged to the rear support 13 through a hinge 14a, and the lower end of the rear connecting arm 14 is rotatably connected to the rear end of the leaf spring assembly 6. The leaf spring frame 11 is fixedly connected to the chassis frame 4;

[0034] When the rear wheels 2 and the rear axle 8 move upward, the lower end of the leaf spring assembly 6 moves upward, and the leaf spring assembly 6 undergoes a diastolic elastic deformation with an increasingly larger radius of curvature. Since the front link arm 10 is fixed, therefore, the diastolic elastic deformation of the leaf spring assembly 6 with an increasingly larger radius of curvature will cause the rear link arm 14 to swing backward adaptively around the c hinge 14a, so that while the lowermost end of the leaf spring assembly 6 moves upward, it also moves backward, and further makes the movement path tend to be consistent with the b hinge 7 end of the wheel axle jump constraint swing rod 3, so as to make the leaf spring assembly 6 deform symmetrically as much as possible in the front and back, thereby reducing the degree of "abnormal elastic deformation" of the leaf spring assembly 6 caused by the movement interference between the leaf spring assembly 6 and the wheel axle jump constraint swing rod 3; however, the movement interference cannot be completely avoided, and further leads to the fact that the "abnormal elastic deformation" cannot be completely eliminated. Therefore, the following second embodiment is additionally designed.

[0035] The second embodiment (such as Figure 6 、 7 、8):

[0036] The leaf spring frame 11 is integrally composed of a floating guide rail beam 11c, a front plunger cylinder 11a and a rear plunger cylinder 11b. The floating guide rail beam 11c extends in the front-rear direction. A guide rail 21 extending in the front-rear direction is arranged on one side of the floating guide rail beam 11c. A slider 20 is guidingly arranged in the guide rail 21. One side of the slider 20 is fixedly connected to the chassis frame 4 through an inner connecting block 18; the front support 12 and the rear support 13 are respectively integrally arranged on the lower sides of the front plunger cylinder 11a and the rear plunger cylinder 11b; the upper end of the rear link arm 14 is fixedly connected to the rear support 13, and the lower end of the rear link arm 14 is rotatably connected to the rear end of the leaf spring assembly 6; the upper end of the front link arm 10 is hinged to the front support 12 through a d hinge 10a, and the lower end of the front link arm 10 is rotatably connected to the front end of the leaf spring assembly 6.

[0037] Since the wheel axle jump constraint swing rod 3 is an inclined structure, when the rear wheel 2 moves upward due to bumps, the lower end of the leaf spring assembly 6 moves upward, and the leaf spring assembly 6 undergoes a diastolic elastic deformation with an increasingly larger radius of curvature. Since the rear link arm 14 is fixed, therefore, the diastolic elastic deformation of the leaf spring assembly 6 with an increasingly larger radius of curvature will cause the front link arm 10 to swing forward adaptively around the d hinge 10a, so that while the lowermost end of the leaf spring assembly 6 moves upward, it also moves forward; at the same time, the wheel axle jump constraint swing rod 3 adaptively swings upward around the a hinge 5. Under the forced constraint of the wheel axle jump constraint swing rod 3, the rear wheel 2 will also move backward during the upward movement.

[0038] While the lowermost end of the leaf spring assembly 6 is displaced upward and offset forward, and the rear wheel 2 is displaced backward during upward movement, a stronger "front-back movement interference" is generated. However, in this solution, the leaf spring bracket 11 can float horizontally freely. Specifically, the leaf spring bracket 11 composed of the floating guide beam 11c, the front plunger cylinder 11a, and the rear plunger cylinder 11b is automatically and adaptively offset backward under the guidance of the slider 20 and the guide rail 21, thereby eliminating the above "front-back movement interference", and effectively alleviating the problem of "abnormal elastic deformation" of the leaf spring assembly 6.

[0039] The following is a further optimized structure based on the "Second Embodiment":

[0040] As Figure 7 and 8 shown, the front plunger cylinder 11a and the rear plunger cylinder 11b are respectively located on the front and rear sides of the connecting block 18, and both the front plunger cylinder 11a and the rear plunger cylinder 11b extend in the front-back direction. One side of both the front plunger cylinder 11a and the rear plunger cylinder 11b is fixedly connected to the floating guide beam 11c; the ends of the front plunger cylinder 11a and the rear plunger cylinder 11b away from each other are closed; a front hydraulic piston 30a and a rear hydraulic piston 30b are respectively arranged in the front plunger cylinder 11a and the rear plunger cylinder 11b; front hydraulic cylinder chambers 23a and rear hydraulic cylinder chambers 23b are respectively formed on the sides of the front plunger cylinder 11a and the rear plunger cylinder 11b away from each other; the ends of the front hydraulic piston 30a and the rear hydraulic piston 30b close to each other are respectively fixedly connected to the connecting block 18 through a front piston rod 17a and a rear piston rod 17b; a liquid exchange channel 22 is provided through the interior of the integral structure composed of the front hydraulic piston 30a, the front piston rod 17a, the connecting block 18, the rear piston rod 17b, and the rear hydraulic piston 30b along the length direction, and the front hydraulic cylinder chamber 23a and the rear hydraulic cylinder chamber 23b are communicated with each other through the liquid exchange channel 22; a conical flow control valve core 26 is coaxially arranged inside the rear end of the liquid exchange channel 22. The thin end of the conical flow control valve core 26 faces forward, and the thick end faces backward, and the rear end of the conical flow control valve core 26 is fixedly connected to the rear end integral cover 70 of the rear plunger cylinder 11b. Hydraulic oil is filled in the front hydraulic cylinder chamber 23a, the rear hydraulic cylinder chamber 23b, and the liquid exchange channel 22.

[0041] From a structural perspective, during the up and down movement of the rear wheel 2, the leaf spring bracket 11 composed of the floating guide beam 11c, the front plunger cylinder 11a, and the rear plunger cylinder 11b is offset forward or backward relative to the chassis frame 4 under the guidance of the slider 20 and the guide rail 21, so that the front hydraulic cylinder chamber 23a and the rear hydraulic cylinder chamber 23b exchange liquid through the liquid exchange channel 22;

[0042] In the no-load state of the vehicle body 1, an annular flow-limiting gap 25 is formed between the outer peripheral wall of the conical columnar flow control valve core 26 and the inner wall of the rear end of the liquid exchange channel 22. In the no-load state of the vehicle, the annular flow-limiting gap 25 is relatively narrow, thus effectively restricting the flow rate of the liquid exchange channel 22, thereby forming an impedance to the forward or backward offset of the leaf spring frame 11 composed of the floating guide rail beam 11c, the front plunger barrel 11a, and the rear plunger barrel 11b relative to the chassis frame 4, so as to achieve the effect of suppressing the bounce of the rear wheels in the no-load state.

[0043] When the vehicle is in the full-load state, the load on the rear wheels 2 increases, the curvature radius of the leaf spring assembly 6 becomes larger, and the wheel axle jump restraint swing rod 3 adaptively swings upward around the a hinge 5 by a certain distance. The leaf spring frame 11 composed of the floating guide rail beam 11c, the front plunger barrel 11a, and the rear plunger barrel 11b automatically offsets backward by a certain distance relative to the "no-load state" under the guidance of the slider 20 and the guide rail 21, causing the conical columnar flow control valve core 26 to displace backward relative to the rear hydraulic piston 30b, and the gap width of the annular flow-limiting gap 25 becomes larger relative to the "no-load state"; thus, the liquid flow in the liquid exchange channel 22 becomes smoother, relatively relieving the flow restriction in the liquid exchange channel 22, so as to achieve the effect of relieving the suppression of the bounce of the rear wheels in the no-load state and avoiding the problem of too hard suspension under the full-load condition.

[0044] Furthermore, the problems of being too soft when no-loaded and too hard when full-loaded are ultimately improved.

[0045] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An electric vehicle leaf spring suspension system, characterized in that: The vehicle comprises a vehicle body (1), wherein the bottom of the vehicle body (1) comprises a chassis frame (4), a rear wheel (2) and a leaf spring suspension; a rear wheel axle (8) of the rear wheel (2) cooperates with the chassis frame (4) via the leaf spring suspension; The leaf spring suspension comprises a leaf spring frame (11), a leaf spring assembly (6) in a downward convex arc shape is arranged on the lower side of the leaf spring frame (11), the rear wheel axle (8) is located below the middle of the leaf spring assembly (6), and the rear wheel axle (8) is connected to the lower middle side of the upper leaf spring assembly (6) via a detachable connecting assembly (9); An oblique wheel axle bounce restraining swing arm (3) is arranged at the lower front of the leaf spring assembly (6); in an initial state, the oblique wheel axle bounce restraining swing arm (3) is in a posture of being higher at the front and lower at the rear; the front end of the wheel axle bounce restraining swing arm (3) is hingedly connected to the chassis frame (4) via an a hinge (5), and the rear end of the wheel axle bounce restraining swing arm (3) is hingedly connected to the rear wheel axle (8) via a b hinge (7).

2. The electric vehicle leaf spring suspension system according to claim 1, characterized in that: A front support (12) and a rear support (13) are respectively fixed to the lower sides of the front and rear parts of the leaf spring frame (11), and the two ends of the leaf spring assembly (6) are respectively connected to the front support (12) and the rear support (13) through an inclined front connecting arm (10) and a rear connecting arm (14).

3. The electric vehicle leaf spring suspension system according to claim 2, characterized in that: The upper end of the front connecting arm (10) is fixedly connected to the front support (12), and the lower end of the front connecting arm (10) is rotatably connected to the front upper end of the leaf spring assembly (6); the upper end of the rear connecting arm (14) is hinged to the rear support (13) via a C hinge (14a), and the lower end of the rear connecting arm (14) is rotatably connected to the rear end of the leaf spring assembly (6).

4. The electric vehicle leaf spring suspension system according to claim 3, characterized in that: The leaf spring frame (11) is fixedly connected to the chassis frame (4).

5. The electric vehicle leaf spring suspension system according to claim 2, characterized in that: The leaf spring frame (11) is integrally formed by a floating guide rail beam (11c), a front plunger cylinder (11a) and a rear plunger cylinder (11b); the floating guide rail beam (11c) extends in the front-rear direction; a guide rail (21) extending in the front-rear direction is arranged on one side of the floating guide rail beam (11c); a slider (20) is arranged in the guide rail (21); one side of the slider (20) is fixedly connected to the chassis frame (4) through an inner connecting block (18); a front support (12) and a rear support (13) are respectively integrally arranged on the lower sides of the front plunger cylinder (11a) and the rear plunger cylinder (11b); The upper end of the rear connecting arm (14) is fixedly connected to the rear support (13), and the lower end of the rear connecting arm (14) is rotatably connected to the rear end of the leaf spring assembly (6); the upper end of the front connecting arm (10) is hinged to the front support (12) via a d hinge (10a), and the lower end of the front connecting arm (10) is rotatably connected to the front end of the leaf spring assembly (6).

6. The electric vehicle leaf spring suspension system according to claim 5, characterized in that: The front plunger tube (11a) and the rear plunger tube (11b) are respectively located at the front and rear sides of the connection block (18), and the front plunger tube (11a) and the rear plunger tube (11b) both extend in the front-to-back direction, and one side of the front plunger tube (11a) and the rear plunger tube (11b) are fixedly connected to the floating guide rail beam (11c); the ends of the front plunger tube (11a) and the rear plunger tube (11b) that are away from each other are closed; A front hydraulic piston (30a) and a rear hydraulic piston (30b) are respectively arranged in the front plunger cylinder (11a) and the rear plunger cylinder (11b); the sides of the front plunger cylinder (11a) and the rear plunger cylinder (11b) that are away from each other form a front hydraulic column chamber (23a) and a rear hydraulic column chamber (23b) respectively; the ends of the front hydraulic piston (30a) and the rear hydraulic piston (30b) that are close to each other are fixedly connected to the connecting block (18) through a front piston rod (17a) and a rear piston rod (17b) respectively; A liquid exchange channel (22) is provided inside the integrated structure formed by the front hydraulic piston (30a), the front piston rod (17a), the connecting block (18), the rear piston rod (17b) and the rear hydraulic piston (30b) along the length direction, and the front hydraulic column chamber (23a) and the rear hydraulic column chamber (23b) are connected to each other through the liquid exchange channel (22).

7. The electric vehicle leaf spring suspension system according to claim 6, characterized in that: A conical columnar flow control valve core (26) is coaxially arranged in the rear end of the liquid exchange channel (22), the thin end of the conical columnar flow control valve core (26) faces forward and the thick end faces backward, and the rear end of the conical columnar flow control valve core (26) is fixedly connected to the rear end integrated cover (70) of the rear plunger cylinder (11b).

8. The electric vehicle leaf spring suspension system according to claim 7, characterized in that: When the vehicle body (1) is in an unloaded and stable state, an annular flow-limiting gap (25) is formed between the outer peripheral wall of the conical columnar flow control valve core (26) and the inner wall of the rear end of the liquid exchange channel (22); when the conical columnar flow control valve core (26) moves backward relative to the rear hydraulic piston (30b), the gap width of the annular flow-limiting gap (25) gradually increases.

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