A vehicle running system with adjustable design parameters

Abstract

This application relates to a vehicle running system with adjustable design parameters, comprising: a frame assembly including parallel and symmetrically arranged longitudinal beams; a front axle assembly including a steering axle I-beam located at the bottom of the longitudinal beams, with steering knuckles for mounting steering wheels rotatably connected to both ends of the steering axle I-beam; and a suspension assembly including a leaf spring assembly fixed to the top of the steering axle I-beam, the front end of which is connected to the longitudinal beams via a leaf spring front bracket; the leaf spring front bracket is connected to the longitudinal beams and its height relative to the longitudinal beams is adjustable to adjust the baseline angle θ1 between the leaf spring assembly and the longitudinal beams. The leaf spring front bracket of this application, connected to the longitudinal beams and with adjustable height relative to the longitudinal beams, adjusts the baseline angle θ1 between the leaf spring assembly and the longitudinal beams, enabling the vehicle to quickly and accurately find suitable design parameters for the running system during the testing phase, thus solving problems such as brake pull and steering wheel misalignment.

Description

Technical Field

[0001] This application relates to the field of commercial vehicle chassis tuning technology, and in particular to a vehicle running system with adjustable design parameters. Background Technology

[0002] Currently, small and medium-sized trucks sometimes experience issues such as brake pull or steering wheel misalignment when fully loaded or unloaded due to factors such as chassis height and the layout of the running gear (steering and suspension systems). For vehicles that have already been designed, the design parameters of the steering and suspension systems cannot be adjusted, making it difficult to address issues like vehicle pull and steering wheel misalignment when fully loaded or unloaded.

[0003] In related technologies, the angle between the plane formed by the axes of the front and rear ends of the leaf spring assembly and the lower flange of the longitudinal beam of the vehicle frame is called the baseline angle θ1. The magnitude of the baseline angle θ1 affects the vertical jump interference of the steering tie rod. The magnitude of the vertical jump interference affects the vehicle's driving stability under braking conditions and the steering wheel tilt under no-load and full-load conditions, respectively. Therefore, in order to achieve good vehicle handling performance, it is necessary to design a reasonable leaf spring baseline angle θ1.

[0004] However, the parameters of the existing vehicle's running system are not adjustable: the height of the leaf spring front bracket is not adjustable, the leaf spring baseline angle is not adjustable, the height and angle of the pads, the thickness of the pads are not adjustable, and the steering gear height is not adjustable. The inability to adjust these parameters makes it difficult to address issues such as brake pull and steering wheel misalignment under load. Summary of the Invention

[0005] This application provides a vehicle running system with adjustable design parameters to solve the problem in related technologies where the parameters of the vehicle running system are not adjustable, resulting in vehicle deviation during braking and steering wheel misalignment when the vehicle is unloaded or fully loaded.

[0006] This application provides a vehicle mobility system with adjustable design parameters, including:

[0007] A chassis assembly, the chassis assembly including parallel and symmetrically arranged longitudinal beams;

[0008] The front axle assembly includes a steering axle I-beam located at the bottom of the longitudinal beam of the frame, and steering knuckles for mounting steering wheels are rotatably connected to both ends of the steering axle I-beam.

[0009] The suspension assembly includes a leaf spring assembly fixed to the top of the steering axle I-beam, the front end of which is connected to the longitudinal beam of the vehicle frame via a leaf spring front bracket;

[0010] The leaf spring front bracket is connected to the frame longitudinal beam and its height relative to the frame longitudinal beam is adjustable to adjust the baseline angle between the leaf spring assembly and the frame longitudinal beam.

[0011] In some embodiments: the leaf spring front bracket includes a vertical mounting plate mounted vertically on the web of the frame longitudinal beam, the vertical mounting plate having a plurality of first elongated holes for adjusting the baseline angle between the leaf spring assembly and the frame longitudinal beam.

[0012] In some embodiments, the leaf spring front bracket further includes a transverse mounting plate horizontally located on the bottom surface of the lower flange plate of the frame longitudinal beam, and a pad is provided between the transverse mounting plate and the lower flange plate of the frame longitudinal beam to adjust the height between the leaf spring front bracket and the frame longitudinal beam.

[0013] In some embodiments: the horizontal mounting plate and the vertical mounting plate are perpendicularly connected to each other, the horizontal mounting plate is provided with positioning holes for positioning the pad, and the bottom surface of the horizontal mounting plate is provided with two leaf spring support arms for mounting the leaf spring assembly.

[0014] In some embodiments, the web of the longitudinal beam of the frame is provided with a plurality of second elongated holes for mounting the front leaf spring bracket, the second elongated holes being used to adjust the mounting height between the front leaf spring bracket and the longitudinal beam of the frame.

[0015] In some embodiments: the steering axle I-beam is provided with U-bolts for fixing the leaf spring assembly to the steering axle I-beam, and a shim is placed between the steering axle I-beam and the leaf spring assembly, the shim being used to adjust the vertical spacing between the steering axle I-beam and the frame longitudinal beam to be constant.

[0016] In some embodiments: the top of the leaf spring assembly is connected to a lower buffer block by a U-bolt, the top of the lower buffer block is higher than the top of the U-bolt, and a limiting steel plate located above the lower buffer block is fixedly provided on the lower flange plate of the frame longitudinal beam.

[0017] In some embodiments, the steering assembly further includes a steering gear bracket fixed to the front end of the frame longitudinal beam, and a steering gear fixed to the steering gear bracket, wherein the steering gear bracket is provided with a fourth elongated hole for adjusting the installation height of the steering gear.

[0018] The output shaft of the steering gear is connected to a steering drop arm. The end of the steering drop arm away from the steering gear is rotatably connected to a steering tie rod. The end of the steering tie rod away from the steering drop arm is rotatably connected to an upper arm that connects to the steering knuckle.

[0019] In some embodiments: the steering knuckle has a third elongated hole for mounting the upper arm, the third elongated hole is used to adjust the mounting height of the upper arm on the steering knuckle, the bottom of both steering knuckles is connected to the lower arm, and a tie rod assembly is rotatably connected between the two lower arms.

[0020] In some embodiments, the suspension assembly further includes a shock absorber assembly connected between the steering axle I-beam and the frame longitudinal beam. The shock absorber assembly includes an upper shock absorber bracket fixed to the frame longitudinal beam and a lower shock absorber bracket fixed to the steering axle I-beam, with a shock absorber connected between the upper shock absorber bracket and the lower shock absorber bracket.

[0021] The beneficial effects of the technical solution provided in this application include:

[0022] This application provides a vehicle running system with adjustable design parameters. The adjustable vehicle running system includes a frame assembly comprising parallel and symmetrically arranged longitudinal beams; a front axle assembly including a steering axle I-beam located at the bottom of the longitudinal beams, with steering knuckles for mounting steering wheels rotatably connected to both ends of the steering axle I-beam; and a suspension assembly including a leaf spring assembly fixed to the top of the steering axle I-beam, the front end of which is connected to the longitudinal beams via a leaf spring front bracket. The leaf spring front bracket is connected to the longitudinal beams and its height relative to the longitudinal beams is adjustable to adjust the baseline angle between the leaf spring assembly and the longitudinal beams.

[0023] Therefore, in this application, the front axle assembly and frame assembly of the vehicle running system with adjustable design parameters are connected via a suspension assembly. The leaf spring assembly of the suspension assembly is fixed to the top of the steering axle I-beam, and the front end of the leaf spring assembly is connected to the frame longitudinal beam via a leaf spring front bracket. To flexibly adjust the baseline angle θ1 between the plane formed by the front and rear axes of the leaf spring assembly and the lower flange of the frame longitudinal beam, the leaf spring front bracket of this application is connected to the frame longitudinal beam and its height relative to the frame longitudinal beam is adjustable. This allows for adjustment of the baseline angle θ1 between the leaf spring assembly and the frame longitudinal beam, enabling the vehicle to quickly and accurately find suitable design parameters for the running system during the testing phase, thus resolving issues of brake pull and steering wheel misalignment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional structural view of an embodiment of this application;

[0026] Figure 2 This is a structural front view of an embodiment of this application;

[0027] Figure 3 This is a front view of the structure of the embodiment of this application excluding the steering assembly;

[0028] Figure 4 This is a first-view perspective structural perspective view of an embodiment of this application excluding the steering assembly;

[0029] Figure 5 This is a second-view perspective structural perspective view of an embodiment of this application, excluding the steering assembly;

[0030] Figure 6 This is a front view of the structure of the leaf spring front bracket according to an embodiment of this application;

[0031] Figure 7 This is a left view of the structure of the leaf spring front bracket according to an embodiment of this application;

[0032] Figure 8 This is a top view of the structure of the plate pad block in an embodiment of this application;

[0033] Figure 9 for Figure 8 A cross-sectional view along the AA direction;

[0034] Figure 10 This is a top view of the limiting steel plate in an embodiment of this application;

[0035] Figure 11 This is a front view of the structure of the limiting steel plate in an embodiment of this application.

[0036] Figure label:

[0037] A. Steering assembly; B. Suspension assembly; C. Frame assembly; D. Front axle assembly; A1. Steering gear bracket; A2. Steering gear; A3. Steering drop arm; A4. Steering tie rod; A5. Upper arm; A6. Steering knuckle; A7. Steering axle I-beam; A8. Lower arm; A9. Tie rod assembly;

[0038] B1. Leaf spring assembly; B2. Front leaf spring bracket; B3. Rear leaf spring hanger bracket; B4. Spacer block; B5. U-bolt; B6. Limiting steel plate; B7. Shock absorber assembly; B8. Lower buffer block; B2A. Pad plate; B21. Horizontal mounting plate; B22. Vertical mounting plate; B211. Positioning hole; B221. First elongated slot hole;

[0039] C1. Frame longitudinal beams. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] This application provides a vehicle running system with adjustable design parameters, which can solve the problem in related technologies where the parameters of the vehicle running system are not adjustable, resulting in problems such as vehicle deviation during braking and steering wheel misalignment when the vehicle is unloaded or fully loaded.

[0042] See Figures 1 to 5 As shown, this application embodiment provides a vehicle running system with adjustable design parameters, including:

[0043] The frame assembly C includes two parallel and symmetrically arranged longitudinal beams C1, which are fixedly connected by multiple crossbeams.

[0044] The front axle assembly D includes a steering axle I-beam A7 located at the bottom of the longitudinal beam C1 of the vehicle frame. Steering knuckles A6 for mounting steering wheels are rotatably connected to both ends of the steering axle I-beam A7. The front axle assembly D is the front steering axle of the vehicle, providing steering for the vehicle.

[0045] The suspension assembly B includes a leaf spring assembly B1 fixed to the top of the steering axle I-beam A7. The front end of the leaf spring assembly B1 is connected to the frame longitudinal beam C1 via a leaf spring front bracket B2, and the rear end of the leaf spring assembly B1 is connected to the frame longitudinal beam C1 via a leaf spring rear hanger bracket B3.

[0046] The leaf spring front bracket B2 is connected to the frame longitudinal beam C1 and its installation position relative to the frame longitudinal beam C1 is adjustable, thereby adjusting the baseline angle θ1 between the leaf spring assembly B1 and the frame longitudinal beam C1.

[0047] In this embodiment of the application, the front axle assembly D and the frame assembly C of the vehicle running system with adjustable design parameters are connected by a suspension assembly B, wherein the leaf spring assembly B1 of the suspension assembly B is fixed to the top of the steering axle I-beam A7, and the front end of the leaf spring assembly B1 is connected to the frame longitudinal beam C1 through the leaf spring front bracket B2.

[0048] In order to flexibly adjust the baseline angle θ1 between the plane formed by the front and rear axes of the leaf spring assembly B1 and the lower flange of the frame longitudinal beam C1, the leaf spring front bracket B2 of this application is connected to the frame longitudinal beam C1 and its height relative to the frame longitudinal beam C1 is adjustable, so as to adjust the baseline angle θ1 between the leaf spring assembly B1 and the frame longitudinal beam C1, so that the vehicle can quickly and accurately find the appropriate design parameters of the running system during the test phase, and solve the problems of brake deviation and steering wheel tilt.

[0049] In some alternative embodiments: see Figure 6 and Figure 7As shown, this application embodiment provides a vehicle running system with adjustable design parameters. The leaf spring front bracket B2 of the vehicle running system includes a vertical mounting plate B22 mounted vertically on the web of the frame longitudinal beam C1. A plurality of first elongated holes B221 are provided on the vertical mounting plate B22 to adjust the baseline angle θ1 between the leaf spring assembly B1 and the frame longitudinal beam C1.

[0050] The vertical mounting plate B22 of the leaf spring front bracket B2 is in contact with the web of the frame longitudinal beam C1. Bolts are inserted into the multiple first elongated holes B221 of the vertical mounting plate B22 and fixedly connected to the web of the frame longitudinal beam C1. Since the first elongated holes B221 are non-circular holes, the vertical mounting plate B22 of the leaf spring front bracket B2 can be adjusted up and down on the web of the frame longitudinal beam C1, thereby adjusting the baseline angle θ1 between the leaf spring assembly B1 and the frame longitudinal beam C1.

[0051] The leaf spring front bracket B2 also includes a transverse mounting plate B21 horizontally located on the bottom surface of the lower flange plate of the frame longitudinal beam C1. A pad B2A is provided between the transverse mounting plate B21 and the lower flange plate of the frame longitudinal beam C1 to adjust the height between the leaf spring front bracket B2 and the frame longitudinal beam C1. The transverse mounting plate B21 is perpendicularly connected to the vertical mounting plate B22. The transverse mounting plate B21 has positioning holes for the positioning pad B2A. Two leaf spring support arms for mounting the leaf spring assembly B1 are provided on the bottom surface of the transverse mounting plate B21.

[0052] The transverse mounting plate B21 transfers the weight of the frame longitudinal beam C1 to the leaf spring assembly B1. The distance h1 between the multiple first elongated holes B221 of the vertical mounting plate B22 and the transverse mounting plate B21 can be adjusted. By increasing or decreasing the distance h1 between the multiple first elongated holes B221 of the vertical mounting plate B22 and the transverse mounting plate B21, the baseline angle θ1 between the leaf spring assembly B1 and the frame longitudinal beam C1 can be adjusted. Furthermore, the distance h2 between the leaf spring support arm and the transverse mounting plate B21 can also be adjusted to further adjust the baseline angle θ1 between the leaf spring assembly B1 and the frame longitudinal beam C1.

[0053] A pad B2A is provided between the transverse mounting plate B21 and the lower flange plate of the frame longitudinal beam C1 to adjust the height between the leaf spring front bracket B2 and the frame longitudinal beam C1. The thickness of the pad B2A is specifically set according to the height adjustment of the vertical mounting plate B22 of the leaf spring front bracket B2 on the web of the frame longitudinal beam C1, so that the transverse mounting plate B21 and the lower flange plate of the frame longitudinal beam C1 can be reliably connected through the pad B2A, and the weight of the frame longitudinal beam C1 can be transferred to the vertical mounting plate B22.

[0054] In some alternative embodiments: see Figures 1 to 5As shown in the figure, this application embodiment provides a vehicle running system with adjustable design parameters. The web of the longitudinal beam C1 of the vehicle running system has multiple second elongated holes (not shown in the figure) for mounting the front leaf spring bracket B2. These second elongated holes are non-circular and can adjust the height between the front leaf spring bracket B2 and the longitudinal beam C1. This allows the vertical mounting plate B22 of the front leaf spring bracket B2 to be adjusted vertically on the web of the longitudinal beam C1, thereby adjusting the baseline angle θ1 between the leaf spring assembly B1 and the longitudinal beam C1.

[0055] In some alternative embodiments: see Figures 3 to 5 , Figure 8 and Figure 9 As shown in the embodiment of this application, a vehicle running system with adjustable design parameters is provided. The steering axle I-beam A7 of this vehicle running system is provided with U-bolts B5 for fixing the leaf spring assembly B1 to the steering axle I-beam A7. A shim B4 is placed between the steering axle I-beam A7 and the leaf spring assembly B1. The shim B4 is used to adjust the vertical distance between the steering axle I-beam A7 and the longitudinal beam C1 of the vehicle frame to maintain a constant value.

[0056] In this embodiment, a shim B4 is placed between the steering axle I-beam A7 and the leaf spring assembly B1. The thickness H1 of the shim B4 is specifically set according to the vertical adjustment range of the vertical mounting plate B22 of the leaf spring front bracket B2 on the web of the frame longitudinal beam C1. When the vertical mounting plate B22 of the leaf spring front bracket B2 is adjusted downward to a certain height on the web of the frame longitudinal beam C1, the thickness H1 of the shim B4 decreases by a certain thickness; when the vertical mounting plate B22 of the leaf spring front bracket B2 is adjusted upward to a certain height on the web of the frame longitudinal beam C1, the thickness H1 of the shim B4 increases by a certain thickness.

[0057] Furthermore, the included angle between the upper and lower surfaces of the pad B4 is θ2. This included angle θ2 can be positive, negative, or zero. The magnitude of the included angle θ2 between the upper and lower surfaces of the pad B4 is specifically set according to the change in the baseline angle θ1 between the leaf spring assembly B1 and the frame longitudinal beam C1. When the baseline angle θ1 between the leaf spring assembly B1 and the frame longitudinal beam C1 increases, the included angle θ2 between the upper and lower surfaces of the pad B4 increases; when the baseline angle θ1 between the leaf spring assembly B1 and the frame longitudinal beam C1 decreases, the included angle θ2 between the upper and lower surfaces of the pad B4 also decreases accordingly.

[0058] In some alternative embodiments: see Figures 3 to 5 , Figure 10 and Figure 11As shown, this application embodiment provides a vehicle running system with adjustable design parameters. The top of the leaf spring assembly B1 of the vehicle running system is connected to a lower buffer block B8 by a U-bolt B5. The top of the lower buffer block B8 is higher than the top of the U-bolt B5. The lower flange plate of the frame longitudinal beam C1 is fixedly provided with a limiting steel plate B6 located above the lower buffer block B8. Multiple limiting steel plates B6 are provided, and the multiple limiting steel plates B6 are stacked and connected to each other at the bottom of the lower flange plate of the frame longitudinal beam C1.

[0059] In this embodiment, the U-bolt B5 fixes the lower buffer block B8 and the leaf spring assembly B1 to the steering axle I-beam A7, and the lower buffer block B8 is located above the middle of the leaf spring assembly B1. The lower buffer block B8 is a rubber block with buffering and shock absorption properties. The lower flange plate of the frame longitudinal beam C1 is fixedly provided with a limiting steel plate B6 located above the lower buffer block B8. When the lower buffer block B8 contacts the limiting steel plate B6, the impact of the leaf spring assembly B1 on the frame longitudinal beam C1 is buffered and damped.

[0060] The thickness H2 of the limiting steel plate B6 is specifically set according to the change in the baseline angle θ1 between the leaf spring assembly B1 and the frame longitudinal beam C1. When the baseline angle θ1 between the leaf spring assembly B1 and the frame longitudinal beam C1 increases, the thickness H2 of the limiting steel plate B6 decreases; when the baseline angle θ1 between the leaf spring assembly B1 and the frame longitudinal beam C1 decreases, the thickness H2 of the limiting steel plate B6 increases, thereby maintaining a constant distance between the leaf spring assembly B1 and the frame longitudinal beam C1.

[0061] In some alternative embodiments: see Figures 1 to 5 As shown, this application embodiment provides a vehicle running system with adjustable design parameters. The vehicle running system also includes a steering assembly A, which includes a steering gear bracket A1 fixed to the front end of the frame longitudinal beam C1, and a steering gear A2 fixed on the steering gear bracket A1. The steering gear bracket A1 is provided with a fourth elongated hole (not shown in the figure) for adjusting the installation height of the steering gear A2.

[0062] The output shaft of steering gear A2 is connected to steering arm A3. The end of steering arm A3 away from steering gear A2 is rotatably connected to steering tie rod A4. The end of steering tie rod A4 away from steering arm A3 is rotatably connected to upper arm A5, which connects to steering knuckle A6. The bottom of the two steering knuckles A6 at both ends of steering axle I-beam A7 is connected to lower arm A8. The two lower arms A8 are rotatably connected to tie rod assembly A9.

[0063] When steering wheel steering action is required, steering gear A2 drives steering arm A3 to swing forward or backward. Steering arm A3 drives steering tie rod A4 to move forward or backward. Steering tie rod A4 drives upper arm A5 and steering knuckle A6 to swing forward or backward, thereby driving steering wheel to swing left or right. At the same time, steering knuckle A6 drives steering wheel on the other side to swing left or right synchronously through lower arm A8 and tie rod assembly A9, thus completing the steering action.

[0064] In this embodiment, a fourth elongated hole is provided on the steering gear bracket A1 to adjust the mounting height of the steering gear A2. This fourth elongated hole can adjust the mounting height of the steering gear A2 on the steering gear bracket A1, thereby adjusting the pitch angle of the steering tie rod A4, so that the angle between the steering tie rod A4 and the frame longitudinal beam C1 is adjustable. During the vehicle testing phase, by adjusting the pitch angle between the steering tie rod A4 and the frame longitudinal beam C1, suitable design parameters for the running gear can be quickly and accurately found, solving problems such as brake pull and steering wheel misalignment.

[0065] In some alternative embodiments: see Figures 1 to 5 As shown in the figure, this application embodiment provides a vehicle running system with adjustable design parameters. The steering knuckle A6 of this running system has a third elongated hole (not shown in the figure) for mounting the upper arm A5. This third elongated hole is used to adjust the mounting height of the upper arm A5 on the steering knuckle A6, thereby adjusting the pitch angle of the steering tie rod A4, so that the angle between the steering tie rod A4 and the frame longitudinal beam C1 is adjustable. During the vehicle testing phase, by adjusting the pitch angle between the steering tie rod A4 and the frame longitudinal beam C1, suitable design parameters for the running system can be quickly and accurately found, solving problems such as brake pull and steering wheel misalignment.

[0066] In some alternative embodiments: see Figures 1 to 5 As shown in the illustration, this application provides a vehicle running system with adjustable design parameters. The suspension assembly A of the vehicle running system further includes a shock absorber assembly B7 connected between the steering axle I-beam A7 and the frame longitudinal beam C1. The shock absorber assembly B7 includes an upper shock absorber bracket B72 fixed to the frame longitudinal beam C1 and a lower shock absorber bracket B73 fixed to the steering axle I-beam A7. A shock absorber B71 is connected between the upper shock absorber bracket B72 and the lower shock absorber bracket B73.

[0067] Working principle

[0068] This application provides a vehicle running system with adjustable design parameters. The adjustable vehicle running system of this application includes a frame assembly C, which comprises parallel and symmetrically arranged longitudinal beams C1; a front axle assembly D, which includes a steering axle I-beam A7 located at the bottom of the longitudinal beams C1, with steering knuckles A6 rotatably connected to both ends of the steering axle I-beam A7 for mounting steering wheels; and a suspension assembly B, which includes a leaf spring assembly B1 fixed to the top of the steering axle I-beam A7. The front end of the leaf spring assembly B1 is connected to the longitudinal beams C1 via a leaf spring front bracket B2. The leaf spring front bracket B2 is connected to the longitudinal beams C1 and its height relative to the longitudinal beams C1 is adjustable to adjust the baseline angle θ1 between the leaf spring assembly B1 and the longitudinal beams C1.

[0069] Therefore, in this application, the front axle assembly D and the frame assembly C of the vehicle running system with adjustable design parameters are connected via a suspension assembly B. The leaf spring assembly B1 of the suspension assembly B is fixed to the top of the steering axle I-beam A7, and the front end of the leaf spring assembly B1 is connected to the frame longitudinal beam C1 via a leaf spring front bracket B2. To flexibly adjust the baseline angle θ1 between the plane formed by the front and rear axes of the leaf spring assembly B1 and the lower flange of the frame longitudinal beam C1, the leaf spring front bracket B2 is connected to the frame longitudinal beam C1 and its height relative to the frame longitudinal beam C1 is adjustable. This allows for adjustment of the baseline angle θ1 between the leaf spring assembly B1 and the frame longitudinal beam C1, enabling the vehicle to quickly and accurately find suitable design parameters for the running system during the testing phase, thus resolving issues of brake pull and steering wheel misalignment.

[0070] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0071] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0072] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A vehicle running system with adjustable design parameters, characterized in that, include: A frame assembly (C) comprising frame longitudinal beams (C1) arranged parallel to each other and symmetrically. The front axle assembly (D) includes a steering axle I-beam (A7) located at the bottom of the frame longitudinal beam (C1), and steering knuckles (A6) for mounting steering wheels are rotatably connected to both ends of the steering axle I-beam (A7). The suspension assembly (B) includes a leaf spring assembly (B1) fixed to the top of the steering axle I-beam (A7), the front end of which is connected to the frame longitudinal beam (C1) via a leaf spring front bracket (B2); The leaf spring front bracket (B2) is connected to the frame longitudinal beam (C1) and its height relative to the frame longitudinal beam (C1) is adjustable to adjust the baseline angle between the leaf spring assembly (B1) and the frame longitudinal beam (C1); The leaf spring front bracket (B2) includes a vertical mounting plate (B22) mounted vertically on the web of the frame longitudinal beam (C1). The vertical mounting plate (B22) has a plurality of first elongated holes (B221) for adjusting the baseline angle between the leaf spring assembly (B1) and the frame longitudinal beam (C1). The leaf spring front bracket (B2) also includes a transverse mounting plate (B21) that is horizontally located on the bottom surface of the lower flange plate of the frame longitudinal beam (C1). A pad (B2A) for adjusting the height between the leaf spring front bracket (B2) and the frame longitudinal beam (C1) is provided between the transverse mounting plate (B21) and the lower flange plate of the frame longitudinal beam (C1). The transverse mounting plate (B21) and the vertical mounting plate (B22) are perpendicularly connected to each other.

2. The vehicle running system with adjustable design parameters as described in claim 1, characterized in that, include: The horizontal mounting plate (B21) has a positioning hole (B211) for positioning the pad (B2A), and the bottom surface of the horizontal mounting plate (B21) has two leaf spring support arms for mounting the leaf spring assembly (B1).

3. The vehicle running system with adjustable design parameters as described in claim 1, characterized in that, include: The web of the frame longitudinal beam (C1) is provided with a plurality of second elongated holes for mounting the leaf spring front bracket (B2). The second elongated holes are used to adjust the mounting height between the leaf spring front bracket (B2) and the frame longitudinal beam (C1).

4. The vehicle running system with adjustable design parameters as described in claim 1, characterized in that, include: The steering axle I-beam (A7) is provided with U-bolts (B5) for fixing the leaf spring assembly (B1) to the steering axle I-beam (A7). A shim (B4) is placed between the steering axle I-beam (A7) and the leaf spring assembly (B1). The shim (B4) is used to adjust the vertical distance between the steering axle I-beam (A7) and the frame longitudinal beam (C1) to be constant.

5. A vehicle running system with adjustable design parameters as described in claim 1, characterized in that, include: The top of the leaf spring assembly (B1) is connected to a lower buffer block (B8) by a U-bolt (B5). The top of the lower buffer block (B8) is higher than the top of the U-bolt (B5). The lower flange of the frame longitudinal beam (C1) is fixedly provided with a limiting steel plate (B6) located above the lower buffer block (B8).

6. A vehicle running system with adjustable design parameters as described in claim 1, characterized in that, include: It also includes a steering assembly (A), which includes a steering gear bracket (A1) fixed to the front end of the frame longitudinal beam (C1) and a steering gear (A2) fixed on the steering gear bracket (A1). The steering gear bracket (A1) is provided with a fourth elongated hole for adjusting the installation height of the steering gear (A2). The output shaft of the steering gear (A2) is connected to a steering drop arm (A3). The end of the steering drop arm (A3) away from the steering gear (A2) is rotatably connected to a steering tie rod (A4). The end of the steering tie rod (A4) away from the steering drop arm (A3) is rotatably connected to an upper arm (A5) that connects to the steering knuckle (A6).

7. A vehicle running system with adjustable design parameters as described in claim 1 or 6, characterized in that, include: The steering knuckle (A6) has a third elongated hole for mounting the upper joint arm (A5). The third elongated hole is used to adjust the mounting height of the upper joint arm (A5) on the steering knuckle (A6). The bottom of both steering knuckles (A6) is connected to the lower joint arm (A8), and the two lower joint arms (A8) are rotatably connected to the tie rod assembly (A9).

8. A vehicle running system with adjustable design parameters as described in claim 1, characterized in that, include: The suspension assembly (B) further includes a shock absorber assembly (B7) connected between the steering axle I-beam (A7) and the frame longitudinal beam (C1). The shock absorber assembly (B7) includes an upper shock absorber bracket (B72) fixed on the frame longitudinal beam (C1) and a lower shock absorber bracket (B73) fixed on the steering axle I-beam (A7). A shock absorber (B71) is connected between the upper shock absorber bracket (B72) and the lower shock absorber bracket (B73).

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