Plate spring assembly, suspension system and vehicle

Abstract

The utility model discloses a plate spring assembly, a suspension system and a vehicle, the plate spring assembly comprises a first support, a second support, an adjusting device and a plate spring, the first support and the second support are arranged on a vehicle frame at intervals in the front-back direction of the vehicle, and the first support is provided with an oblong hole extending in the front-back direction of the vehicle; the adjusting device is arranged on the first support and comprises an eccentric cam bolt, the eccentric cam bolt is provided with an eccentric cam part and a shaft body part which are sequentially arranged, and the shaft body part is suitable for penetrating through the long circular hole and selectively moves in the length direction of the long circular hole; the plate spring is arranged on the front axle or the rear axle, and the two ends of the plate spring are connected with the axle body part and the second support correspondingly. According to the plate spring assembly, the eccentric cam bolt can drive the plate spring to move so as to adjust the left and right axle distance of the vehicle to the preset value, and therefore the driving linearity, riding comfort and safety of the vehicle can be improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a leaf spring assembly, a suspension system, and a vehicle. Background Art

[0002] The wheelbase of a vehicle refers to the distance between the center points of two adjacent wheels on the same side of the vehicle. It is a crucial parameter in vehicle design and manufacturing, directly affecting the vehicle's driving stability and safety. However, in the production of commercial vehicles, the chassis components involve various materials, complex manufacturing processes, and numerous assembly steps, resulting in large manufacturing tolerances and low precision. This leads to a significant difference in the left and right wheelbases, which reduces the vehicle's driving stability and safety. For example, when driving on the road, due to the large difference in wheelbases, the vehicle tends to veer towards the side with the shorter wheelbase, causing a drifting problem. This affects the driver's experience and increases safety hazards during driving. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of this application is to provide a leaf spring assembly that can drive the leaf spring to move via an eccentric cam bolt, thereby adjusting the left and right wheelbase of a vehicle to a preset value, thereby improving the vehicle's straightness, ride comfort, and safety.

[0004] This application also proposes a suspension system having the aforementioned leaf spring assembly.

[0005] This application also proposes a vehicle having the above-described suspension system.

[0006] According to a first aspect embodiment of the present application, the leaf spring assembly includes: a first bracket, a second bracket, an adjusting device, and a leaf spring. The first bracket and the second bracket are spaced apart on the vehicle frame along the vehicle's longitudinal direction. The first bracket has an elongated hole extending in the vehicle's longitudinal direction. The adjusting device is disposed on the first bracket and includes an eccentric cam bolt. The eccentric cam bolt has an eccentric cam portion and a shaft portion arranged sequentially. The shaft portion is adapted to pass through the elongated hole and can be selectively moved along the length direction of the elongated hole. The leaf spring is disposed on the front axle or the rear axle, and both ends of the leaf spring are respectively connected to the shaft portion and the second bracket.

[0007] According to some embodiments of this application, the first bracket includes: a top plate and side plates connected to both sides of the width of the top plate and extending away from the vehicle frame. Each of the two side plates has a limiting member on the side opposite to each other. Each of the two limiting members has the elongated hole and defines a limiting cavity. The eccentric cam portion is rotatably disposed in the limiting cavity of the limiting member on one of the side plates, so as to selectively drive the shaft portion to move along the length direction of the elongated hole.

[0008] In some embodiments, the adjusting device further includes: a locking nut, the locking nut being adapted to engage with the end of the shaft portion away from the eccentric cam portion on the other side plate where the limiting member is located, via a threaded connection, to restrict the movement of the shaft portion.

[0009] Furthermore, the adjusting device further includes an eccentric cam component, which is sleeved on the outer periphery of the shaft body and housed in the limiting cavity of the limiting component on another side plate, and is located between the anti-loosening nut and the side plate.

[0010] Furthermore, the shaft portion includes a first shaft segment and a second shaft segment disposed axially away from the eccentric cam portion, the shaft diameter of the first shaft segment being larger than the shaft diameter of the second shaft segment, and the second shaft segment being adapted to cooperate with the eccentric cam component and the anti-loosening nut.

[0011] Furthermore, the outer periphery of the second shaft segment has at least one axially extending groove, the eccentric cam member has a through hole adapted for the second shaft segment to pass through, and the inner wall of the through hole is provided with protrusions corresponding to the grooves one by one, each of the protrusions being adapted to extend into the corresponding groove.

[0012] According to some embodiments of this application, the eccentric cam portion and / or the eccentric cam member has a plurality of scale line holes spaced apart circumferentially, one end of each scale line hole defining a scale line. The limiting member includes: a body plate, an end plate, and an indicator plate. The body plate is connected to the side plate and has the elongated hole. The end plates are disposed at both ends of the body plate in the vehicle longitudinal direction and extend away from the side plate. The two end plates are adapted to abut against the outer peripheral surface of the eccentric cam portion or the outer peripheral surface of the eccentric cam member. The indicator plate is disposed on one side of the body plate, and one side of the indicator plate defines an indicator vertical line. The indicator vertical line is adapted to be displayed in the scale line hole to indicate the corresponding scale line.

[0013] In some embodiments, the single-stroke travel distance of the shaft portion within the elongated hole is configured to be L, and satisfies: 4mm≤L≤8mm.

[0014] According to a second aspect embodiment of the present application, the suspension system includes: a first leaf spring assembly and a second leaf spring assembly, the first leaf spring assembly and the second leaf spring assembly being opposite each other in the left-right direction of the vehicle, and at least one of them being configured as a leaf spring assembly as described in any of the above embodiments.

[0015] According to a third aspect of this application, the vehicle includes the suspension system described in the above embodiments.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the cooperation between a leaf spring assembly and a vehicle frame, etc., according to some embodiments of this application;

[0019] Figure 2 This is a partial structural schematic diagram of a leaf spring assembly according to some embodiments of this application;

[0020] Figure 3 This is an exploded view of the structure of the first support and the adjustment device in cooperation with some embodiments of this application;

[0021] Figure 4 This is a schematic diagram of an eccentric cam bolt according to some embodiments of this application;

[0022] Figure 5 This is a schematic diagram of a first bracket according to some embodiments of this application;

[0023] Figure 6 This is a schematic diagram of an eccentric cam component according to some embodiments of this application.

[0024] Figure label:

[0025] 1. Leaf spring assembly; 2. Shock absorber assembly; 3. Buffer block assembly; 4. Chassis;

[0026] 10. First support; 10a. Oblong hole;

[0027] 11. Top slab;

[0028] 12. Side panel; 12a. First side panel; 12b. Second side panel;

[0029] 13. Limiting component; 131. Body plate; 132. End plate; 133. Indicator plate; 133a. Indicator vertical line;

[0030] 20. Second bracket; 21. Mounting bracket; 22. Lifting lug assembly;

[0031] 30. Adjustment device; 30a. Scale hole;

[0032] 31. Eccentric cam bolt;

[0033] 311. Eccentric cam section;

[0034] 312, Shaft body portion; 3121, First shaft section; 3122, Second shaft section; 3122a, Groove;

[0035] 313. Bolt section;

[0036] 32. Anti-loosening nuts;

[0037] 33. Eccentric cam component; 331. Through hole; 332. Protrusion;

[0038] 40. Leaf spring. Detailed Implementation

[0039] 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 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.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0041] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0043] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0044] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0045] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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.

[0046] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0047] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0048] In this application, "multiple" means two or more (including two).

[0049] The following is for reference. Figures 1-6This application describes a leaf spring assembly 1, a suspension system, and a vehicle according to embodiments thereof.

[0050] like Figure 1 and Figure 2 As shown, according to the first aspect embodiment of the present application, the leaf spring assembly 1 includes: a first bracket 10, a second bracket 20, an adjustment device 30, and a leaf spring 40.

[0051] The first bracket 10 and the second bracket 20 are spaced apart on the vehicle frame 4 along the front-rear direction of the vehicle. The first bracket 10 has an elongated hole 10a extending in the front-rear direction of the vehicle. The adjustment device 30 is disposed on the first bracket 10 and includes an eccentric cam bolt 31. The eccentric cam bolt 31 has an eccentric cam portion 311 and a shaft portion 312 arranged in sequence. The shaft portion 312 is adapted to pass through the elongated hole 10a and can be selectively moved along the length direction of the elongated hole 10a. The leaf spring 40 is disposed on the front axle or the rear axle, and the two ends of the leaf spring 40 are respectively connected to the shaft portion 312 and the second bracket 20.

[0052] Specifically, the first bracket 10 and the second bracket 20 serve as the fixing base for the leaf spring assembly 1. They are installed on the frame 4 at intervals along the front-rear direction of the vehicle. The first bracket 10 has an elongated hole 10a extending in the front-rear direction of the vehicle. This elongated hole 10a can provide installation space and adjustment space for at least part of the adjusting device 30. The adjusting device 30 is installed on the first bracket 10 and includes an eccentric cam bolt 31. The eccentric cam bolt 31 has a connected eccentric cam portion 311 and a shaft portion 312. The eccentric cam portion 311 is eccentrically set relative to the shaft portion 312, which can be understood as an eccentric cam. The axis of part 311 is spaced apart from the axis of shaft part 312. Shaft part 312 passes through the elongated hole 10a of the first bracket 10. The eccentric cam part 311 can be the driving part of the eccentric cam bolt 31, so as to drive the eccentric cam bolt 31 to rotate as a whole, so that shaft part 312 can move along the length of the elongated hole 10a, thereby allowing the adjusting device 30 to move within a preset range in the vehicle's longitudinal direction. Leaf spring 40 can be set on the front axle, correspondingly forming the front suspension of the vehicle, or leaf spring 40 can be set on the rear axle, correspondingly forming the rear suspension of the vehicle. Leaf spring 40 is an elastic element that can effectively absorb and mitigate impacts and vibrations from the road surface, improving the vehicle's driving performance and ride comfort. One end of the leaf spring 40 in the extension direction is connected to the first bracket 10 through the shaft part 312 of the eccentric cam bolt 31, and the other end is connected to the second bracket 20 to realize the installation of the leaf spring 40. The first bracket 10 and the second bracket 20 can transfer part of the vehicle's load to the frame 4, and together with the leaf spring 40 and the adjustment device 30, they jointly bear the impact and vibration from the road surface.

[0053] It should be noted that one end of the leaf spring 40 in the extending direction is connected to the shaft part 312 of the eccentric cam bolt 31, so that the shaft part 312 can move in the elongated hole 10a, which can drive the leaf spring 40 to move in the front-rear direction of the vehicle. Since the leaf spring 40 is connected to the axle, the leaf spring 40 can drive the axle to move in the front-rear direction of the vehicle, thereby realizing the adjustment of the vehicle wheelbase.

[0054] According to the leaf spring assembly 1 of this application, the position of the leaf spring 40 relative to the first bracket 10 and the second bracket 20 can be conveniently adjusted by the eccentric cam bolt 31 to precisely adjust the vehicle wheelbase. Compared with the related art, the mounting point and length of the leaf spring 40 in the suspension system are fixed and cannot be adjusted, which cannot solve the problem of deviation caused by large differences in the left and right wheelbases. In this application, the position of the leaf spring 40 is adjustable by the adjustment device 30, so that the left and right wheelbases of the vehicle can be adjusted. This can compensate for the manufacturing and processing errors of various chassis components and the errors in production and assembly, ensuring that the left and right wheelbases of the vehicle are to the preset values, thereby improving the straightness, stability and safety of the vehicle.

[0055] Furthermore, in some specific embodiments of this application, such as Figure 1 As shown, the second bracket 20 includes a mounting frame 21 and a lug assembly 22. One end of the mounting frame 21 is fixedly connected to the vehicle frame 4, and the lug assembly 22 is movably disposed at the other end of the mounting frame 21 and connected to the leaf spring 40. The mounting frame 21 ensures that the second bracket 20 as a whole can be stably supported on the vehicle frame 4 and bear the weight and load from the vehicle; the lug assembly 22 can move relative to the mounting frame 21 to adjust the position of the leaf spring 40 and ensure the normal elastic cushioning operation of the leaf spring 40.

[0056] like Figure 2 , Figure 3 as well as Figure 5 As shown, according to some embodiments of this application, the first bracket 10 includes: a top plate 11 and side plates 12 that are connected to both sides of the width of the top plate 11 and extend away from the frame 4.

[0057] Each of the two side plates 12 has a limiting member 13 on the side opposite to each other. Both limiting members 13 have an elongated hole 10a and define a limiting cavity. An eccentric cam portion 311 is rotatably disposed in the limiting cavity of the limiting member 13 of one of the side plates 12, so as to selectively drive the shaft portion 312 to move along the length direction of the elongated hole 10a.

[0058] Specifically, the top plate 11 can have a certain width in the left and right directions of the vehicle and a certain thickness in the height direction of the vehicle. The top plate 11 abuts against the frame 4 on one side in the thickness direction. The side plates 12 are provided on both sides of the width of the top plate 11 and extend away from the frame 4 in the thickness direction of the top plate 11 (i.e., the height direction of the vehicle). The two side plates 12 are opposite to each other and form a stable support structure. In this way, the overall load-bearing capacity of the first bracket 10 can be enhanced, the durability can be improved, and more possibilities and flexibility can be provided for its connection with the frame 4 and other components such as the adjustment device 30.

[0059] The two side plates 12 mentioned above can be respectively constructed as a first side plate 12a and a second side plate 12b. The first side plate 12a, the second side plate 12b, and the top plate 11 can define a receiving cavity on the side facing each other to provide connection and installation space for the adjustment device 30 and the leaf spring 40, etc. A first limiting member 13 can be provided on the side of the first side plate 12a away from the second side plate 12b, and a second limiting member 13 can be provided on the side of the second side plate 12b away from the first side plate 12a. Both the first limiting member 13 and the second limiting member 13 have an elongated hole 10a and a limiting cavity. The eccentric cam portion 311 of the eccentric cam bolt 31 is rotatably installed in the limiting cavity of the first limiting member 13 or the second limiting member 13, and at least a portion of the outer peripheral surface of the eccentric cam portion 311 abuts against at least a portion of the inner wall of the limiting cavity to restrict the movement of the eccentric cam portion 311 in the vehicle's longitudinal direction. The shaft portion 312, connected to the eccentric cam portion 311, passes through two elongated holes 10a on the limiting members 13. When the eccentric cam portion 311 rotates within the limiting cavity, it can push or pull the shaft portion 312, causing it to move along the length of the elongated holes 10a. This, in turn, drives the leaf spring 40 to move in the longitudinal direction of the vehicle, thereby enabling adjustment and control of the wheelbase. By providing the top plate 11, side plate 12, and limiting members 13, the adjustment accuracy and stability of the leaf spring assembly 1 can be improved, and the entire leaf spring assembly 1 can be made more compact and efficient.

[0060] Furthermore, in some specific embodiments of this application, the limiting member 13 is welded to the side plate 12. Welded connections have advantages such as high connection strength, simple connection, and low cost. Therefore, by constructing the connection between the limiting member 13 and the side plate 12 as a welded connection, it is beneficial to improve the stability and efficiency of the connection between the limiting member 13 and the side plate 12, and save production costs.

[0061] like Figure 3 As shown, according to some embodiments of this application, the adjusting device 30 further includes: a locking nut 32, which is adapted to be threadedly engaged with one end of the shaft portion 312 away from the eccentric cam portion 311 on the side of another side plate 12 where the limiting member 13 is provided, so as to restrict the movement of the shaft portion 312.

[0062] Specifically, the anti-loosening nut 32 can be installed on the side of another side plate 12 (i.e., the side plate 12 opposite to the side plate 12 with the eccentric cam portion 311) with the limiting member 13. For example, if the eccentric cam portion 311 is rotatably installed in the limiting cavity of the first limiting member 13 on the first side plate 12a, then the anti-loosening nut 32 is installed on the side of the second side plate 12b with the second limiting member 13. One axial end of the shaft portion 312 of the eccentric cam bolt 31 is connected to the eccentric cam portion 311 and passes through the elongated hole 10a on the limiting member 13 of the side plate 12 where the eccentric cam portion 311 is located. The other axial end of the shaft portion 312 passes through the elongated hole 10a on the limiting member 13 of another side plate 12 and is fixedly connected to the anti-loosening nut 32 through thread engagement. It can be understood that the anti-loosening nut 32 locks the end of the shaft portion 312 away from the eccentric cam portion 311 in the axial direction to fix the shaft portion 312 and the eccentric cam bolt 31 as a whole.

[0063] When wheelbase adjustment is required, the anti-loosening nut 32 separates from the shaft body 312, allowing the shaft body 312 to move within the elongated hole 10a, thereby moving the leaf spring 40 and adjusting the wheelbase. Once the shaft body 312 is in position within the elongated hole 10a and the wheelbase is adjusted to the preset value, the anti-loosening nut 32 engages with the shaft body 312 via a threaded connection, restricting the movement of the shaft body 312 and ensuring the axle remains stably within the preset value. The restrictive and fixing effect of the anti-loosening nut 32 prevents the shaft body 312 from moving under external vibration or impact, effectively ensuring the adjustment accuracy and stability of the leaf spring assembly 1. Furthermore, the threaded engagement between the anti-loosening nut 32 and the shaft body 312 makes locking and unlocking the shaft body 312 relatively simple and easy to operate, improving the ease of adjustment and maintenance of the adjustment device 30.

[0064] Furthermore, in some specific embodiments of this application, such as Figure 4 As shown, the eccentric cam portion 311 has a bolt portion 313 that is collinear with the axis of the shaft portion 312 on the side axially opposite to the shaft portion 312. This allows the shaft portion 312 to be locked and unlocked by applying torque through the bolt portion 313 using a wrench or other professional tools or a robot, thereby further improving the installation and maintenance efficiency and convenience of the adjustment device 30.

[0065] like Figure 3 and Figure 6 As shown, according to some embodiments of this application, the adjusting device 30 further includes: an eccentric cam 33, which is sleeved on the outer periphery of the shaft portion 312 and housed in the limiting cavity of the upper limit member 13 of another side plate 12, and is located between the anti-loosening nut 32 and the side plate 12.

[0066] Specifically, the eccentric cam 33 is housed in the limiting cavity, and the limiting member 13 can restrict the movement of the eccentric cam 33 in the front-rear direction of the vehicle. At the same time, the eccentric cam 33 is sleeved on the outer periphery of the end of the shaft portion 312 away from the eccentric cam portion 311. When the shaft portion 312 rotates, the eccentric cam 33 can rotate synchronously with the rotation of the shaft portion 312, so that the end of the shaft portion 312 away from the eccentric cam portion 311 moves in the elongated hole 10a. Thus, the two ends of the shaft portion 312 in the axial direction can move synchronously in the two elongated holes 10a along the length of the elongated hole 10a, so as to accurately and stably drive the leaf spring 40 to move in the front-rear direction of the vehicle. In this way, the accuracy and stability of wheelbase adjustment and control can be improved.

[0067] It should be noted that in traditional related technologies, the anti-loosening nut 32 acts directly on the shaft 312 to restrict its movement. This direct contact often leads to wear between the two, especially under long-term load and frequent adjustment. In this embodiment, the eccentric cam 33 is positioned between the anti-loosening nut 32 and the shaft 312, acting as a buffer and distributing pressure. When the shaft 312 is subjected to external force (such as pushing or pulling by the eccentric cam 311), the resulting stress and friction are first applied to the eccentric cam 33. Because the eccentric cam 33 has a relatively large contact area and a smoother profile, it effectively disperses these stresses and frictions, thereby reducing direct wear on the shaft 312 and the anti-loosening nut 32. Therefore, the eccentric cam 33 protects the anti-loosening nut 32 and the shaft 312, improving their reliability and lifespan, thus extending the service life of the entire adjustment device 30. In addition, the relatively large area and smooth contour of the eccentric cam 33 help to enhance the connection strength between the entire adjustment device 30 and the side plate 12, thereby improving the stability of the entire leaf spring assembly 1.

[0068] Furthermore, in some specific embodiments of this application, the outer peripheral contour shape of the eccentric cam 33 is configured to be consistent with the outer peripheral contour shape of the eccentric cam portion 311. By setting the outer peripheral contour shape of the eccentric cam 33 to be consistent with that of the eccentric cam portion 311, firstly, it is beneficial for the eccentric cam 33 and the eccentric cam portion 311 to maintain a high degree of coordination and synchronization during rotation. This helps ensure that the adjusting device 30 can move according to a predetermined trajectory and speed when adjusting the front and rear positions of the leaf spring 40, thereby achieving a more precise adjustment effect. Secondly, the consistency of the contours of the eccentric cam 33 and the eccentric cam portion 311 allows them to generate the same or similar contact force and contact position when in contact with the leaf spring 40 or other related components. This helps ensure that the adjusting device 30 can maintain stable performance during adjustment, thereby improving the reliability and consistency of the entire leaf spring assembly 1. Thirdly, the consistent setting of the contours of the eccentric cam 33 and the eccentric cam portion 311 also helps to simplify the production process, improve production efficiency, and save manufacturing costs.

[0069] like Figure 4 As shown, according to some embodiments of this application, the shaft portion 312 includes a first shaft segment 3121 and a second shaft segment 3122 disposed axially away from the eccentric cam portion 311.

[0070] The first shaft segment 3121 has a larger shaft diameter than the second shaft segment 3122, and the second shaft segment 3122 is suitable for cooperating with the eccentric cam component 33 and the anti-loosening nut 32.

[0071] Specifically, the shaft body 312 can be composed of a first shaft segment 3121 and a second shaft segment 3122. The first shaft segment 3121 is connected to the eccentric cam portion 311 at one end in the axial direction, and the second shaft segment 3122 is connected to the end of the first shaft segment 3121 that is axially away from the eccentric cam portion 311. The first shaft segment 3121 passes through an elongated hole 10a on one of the side plates 12, and the second shaft segment 3122 passes through an elongated hole 10a on the other side plate 12. The first shaft segment 3121 is adapted to be connected to one end of the leaf spring 40, and the second shaft segment 3122 is adapted to cooperate with the eccentric cam 33 and the anti-loosening nut 32. The eccentric cam 33 is sleeved on at least part of the outer periphery of the second shaft segment 3122 to ensure the synchronicity of the movement of the second shaft segment 3122 and the first shaft segment 3121 within the elongated hole 10a. The outer periphery of the second shaft segment 3122 may be threaded to be connected with the anti-loosening nut 32 through threaded engagement, so as to enable the locking and unlocking operation of the second shaft segment 3122.

[0072] It should be noted that the shaft diameter of the first shaft segment 3121 is larger than that of the second shaft segment 3122. The relatively large shaft diameter of the first shaft segment 3121 can provide stronger structural support, which helps to resist the force and torque from the leaf spring 40 or other components, and is conducive to improving the reliability and durability of the first shaft segment 3121. The relatively small shaft diameter of the second shaft segment 3122 is convenient to cooperate with small-sized components such as the eccentric cam component 33 and the anti-loosening nut 32, and also helps to reduce the weight and cost of the entire shaft body 312.

[0073] like Figure 4 As shown, according to some embodiments of this application, the outer periphery of the second shaft segment 3122 has at least one axially extending groove 3122a, the eccentric cam member 33 has a through hole 331, the through hole 331 is adapted for the second shaft segment 3122 to pass through, and the inner wall of the through hole 331 is provided with protrusions 332 corresponding one-to-one with the groove 3122a, each protrusion 332 being adapted to extend into the corresponding groove 3122a.

[0074] Specifically, the outer periphery of the second shaft segment 3122 may have an axially extending groove 3122a. The groove 3122a is used to cooperate with the protrusion 332 on the inner wall of the through hole 331 on the eccentric cam member 33. When the second shaft segment 3122 passes through the through hole 331 of the eccentric cam member 33, the protrusion 332 on the inner wall of the through hole 331 is adapted to extend into the corresponding groove 3122a on the outer periphery of the second shaft segment 3122. This allows for circumferential positioning between the eccentric cam member 33 and the second shaft segment 3122, ensuring that the eccentric cam member 33 and the second shaft segment 3122 rotate synchronously without relative sliding or misalignment in the circumferential direction. Consequently, the eccentric cam member 33 and the eccentric cam part 311 rotate synchronously. This synchronicity ensures the consistency of movement of the second shaft segment 3122 and the first shaft segment 3121 within the elongated hole 10a, guaranteeing good coordination and precision of the entire leaf spring assembly 1 during adjustment.

[0075] It should be noted that the grooves 3122a on the outer periphery of the second shaft segment 3122 can be constructed as one or more. When the outer periphery of the second shaft segment 3122 has multiple grooves 3122a, the multiple grooves 3122a are spaced apart in the circumferential direction of the second shaft segment 3122, and the inner wall of the through hole 331 has multiple protrusions 332 corresponding one-to-one with the grooves 3122a. By constructing multiple grooves 3122a and protrusions 332, multiple limiting structures are provided between the eccentric cam member 33 and the second shaft segment 3122, which can further enhance the limiting effect and further increase the reliability of the circumferential limiting between the eccentric cam member 33 and the second shaft segment 3122.

[0076] In some specific embodiments, the grooves 3122a are configured as two evenly spaced on the outer periphery of the second shaft segment 3122, and the protrusions 332 on the inner wall of the through hole 331 are configured as two that fit one-to-one with the grooves 3122a, so as to control costs while ensuring good positioning effect.

[0077] like Figure 4 and Figure 6 As shown, according to some embodiments of this application, the eccentric cam portion 311 and / or the eccentric cam member 33 have a plurality of scale line holes 30a arranged circumferentially, one end of each scale line hole 30a defining a scale line, and the limiting member 13 includes: a body plate 131, an end plate 132 and an indicator plate 133.

[0078] The main body plate 131 is connected to the side plate 12 and has an elongated hole 10a; the end plates 132 are disposed at both ends of the main body plate 131 in the vehicle front-rear direction and extend away from the side plate 12, and the two end plates 132 are adapted to abut against the outer peripheral surface of the eccentric cam portion 311 or the outer peripheral surface of the eccentric cam member 33; the indicator plate 133 is disposed on one side of the main body plate 131, and one side of the indicator plate 133 defines an indicator vertical line 133a, which is adapted to be displayed in the scale hole 30a to indicate the corresponding scale line.

[0079] Specifically, the limiting member 13 can be composed of a body plate 131, an end plate 132, and an indicator plate 133. The main body plate 131 is connected to the side plate 12, and the main body plate 131 has a through elongated hole 10a for the shaft portion 312 to pass through; the end plates 132 can be constructed as two and respectively disposed at both ends of the main body plate 131 in the vehicle longitudinal direction, and the end plates 132 extend away from the side plate 12 in the thickness direction of the main body plate 131. The two end plates 132 abut against the outer peripheral surface of the eccentric cam portion 311 or the outer peripheral surface of the eccentric cam member 33 on the side facing each other, so as to restrict the movement of the eccentric cam portion 311 and the eccentric cam member 33 in the vehicle longitudinal direction, so that the eccentric cam portion 311 and the eccentric cam member 33 can only rotate within the limiting cavity; the indicator plate 133 can be disposed on one side of the main body plate 131 in the extension direction of the side plate 12, and one side of the indicator plate 133 defines an indicator vertical line 133a, which can be understood as at least a portion of the edge of the indicator plate 133 defining the indicator vertical line 133a.

[0080] The eccentric cam portion 311 and the eccentric cam member 33 may each have multiple scale holes 30a. Each scale hole 30a defines a scale line at its end furthest from the center. These scale lines are evenly spaced along the circumference of the eccentric cam portion 311 or the eccentric cam member 33 to identify the rotation angle of the eccentric cam portion 311 or the eccentric cam member 33. An indicator vertical line 133a can be displayed in the scale hole 30a to indicate the corresponding scale line. On the side of the eccentric cam portion 311 and the eccentric cam member 33 facing away from each other, the alignment of the indicator vertical line 133a with the scale line can be observed. Thus, the observer can intuitively see the current adjustment position and determine the required adjustment amount. This improves the convenience and accuracy of the adjustment operation, thereby improving the adjustment accuracy, reliability, and efficiency of the entire leaf spring assembly 1.

[0081] Furthermore, in some embodiments, both the eccentric cam portion 311 and the eccentric cam member 33 have multiple scale lines, one of which is designated as the "0" scale line, and the central angle corresponding to the gap between two adjacent scale lines is 2°. When the indicator vertical line 133a aligns with the "0" scale line on the eccentric cam portion 311 and the eccentric cam member 33, it indicates that the theoretical installation position is reached. When the bolt portion 313 of the eccentric cam bolt 31 is rotated, the other scale lines on the eccentric cam portion 311 and the eccentric cam member 33 will align with the indicator vertical line 133a, thereby enabling accurate identification of the rotation angle of the eccentric cam bolt 31.

[0082] like Figure 3 As shown, according to some embodiments of this application, the single-stroke travel of the shaft portion 312 within the elongated hole 10a is L, and satisfies: 4mm≤L≤8mm.

[0083] Specifically, when the single-stroke travel of the shaft portion 312 within the elongated hole 10a is less than 4mm, for example, 1mm, 2mm, or 3mm, the single-stroke travel of the shaft portion 312 within the elongated hole 10a is too small, resulting in a limited adjustment range and preventing the wheelbase from being adjusted to the preset value, thus still causing the vehicle to veer off course. When the single-stroke travel of the shaft portion 312 within the elongated hole 10a is greater than 8mm, for example, 10mm, 12mm, or 15mm, the required opening length and area of ​​the elongated hole 10a that mates with the shaft portion 312 are too large. The increased opening length and area of ​​the elongated hole 10a mean that more material is removed from the side plate 12, which directly leads to a decrease in the overall stiffness of the side plate 12, thereby reducing the performance and reliability of the entire leaf spring assembly 1.

[0084] In this embodiment, the single-stroke travel of the shaft portion 312 within the elongated hole 10a is set within the range of 4mm to 8mm. For example, the single-stroke travel of the shaft portion 312 within the elongated hole 10a can be 4mm, 6mm, or 8mm, etc., making the adjustable range of the adjusting device 30 suitable. This can compensate for manufacturing and assembly errors in various components of the vehicle chassis, ensuring that the wheelbase can be smoothly adjusted to the preset value, thereby improving the straightness, stability, and safety of the vehicle. Simultaneously, it avoids excessive material removal from the side plate 12 due to the elongated hole 10a, ensuring good structural rigidity of the side plate 12 and improving its reliability and lifespan.

[0085] According to the leaf spring assembly 1 of this application, the wheelbase adjustment process is as follows: at the initial position, rotate the bolt part 313 of the eccentric cam bolt 31 to drive the entire eccentric cam bolt 31 to rotate and drive the eccentric cam component 33 to rotate synchronously. Under the limiting action of the limiting member 13, the shaft part 312 moves along the length direction of the elongated hole 10a, driving the leaf spring 40 to move in the front-rear direction of the vehicle. When the wheelbase is adjusted to the preset value, fix the anti-loosening nut 32 to lock the eccentric cam bolt 31 and the eccentric cam component 33, thereby ensuring the overall firm connection of the leaf spring assembly 1.

[0086] like Figures 1-6 As shown, according to a second aspect embodiment of the present application, the suspension system includes: a first leaf spring assembly and a second leaf spring assembly.

[0087] The first leaf spring assembly and the second leaf spring assembly are opposite each other in the left-right direction of the vehicle, and at least one of them is constructed as leaf spring assembly 1 as described in any of the above embodiments.

[0088] Specifically, the first leaf spring assembly and the second leaf spring assembly are arranged opposite each other in the left-right direction of the vehicle to maintain good balance and stability. At least one of the first leaf spring assembly and the second leaf spring assembly is constructed as leaf spring assembly 1 in the above embodiments. Exemplarily, in some embodiments, only the first leaf spring assembly can be constructed as leaf spring assembly 1 in the above embodiments, in which case the first leaf spring assembly can adjust the distance to one side of the vehicle in the left-right direction, such as adjusting the distance to the left side of the vehicle. In other embodiments, only the second leaf spring assembly can be constructed as leaf spring assembly 1 in the above embodiments, in which case the second leaf spring assembly can adjust the distance to the other side of the vehicle in the left-right direction, such as adjusting the distance to the right side of the vehicle. In still other embodiments, both the first leaf spring assembly and the second leaf spring assembly can be constructed as leaf spring assembly 1, in which case the distance to the left side and the distance to the right side of the vehicle can be adjusted to improve the driving performance and ride comfort of the vehicle.

[0089] Furthermore, in some specific embodiments of this application, such as Figure 1 As shown, the suspension system also includes: a shock absorber assembly 2 and a buffer block assembly 3. The shock absorber assembly 2 is located between the vehicle frame 4 and the leaf spring 40. The shock absorber assembly 2 can absorb and dissipate vibration energy from the road surface through its internal damping mechanism, thereby improving the vehicle's stability and ride comfort. The buffer block assembly 3 is located on the side of the leaf spring 40 facing the vehicle frame 4. The buffer block assembly 3 can absorb impact loads and provides good cushioning protection between the leaf spring 40 and the vehicle frame 4.

[0090] like Figures 1-6 As shown, the vehicle according to the third aspect embodiment of this application includes: the suspension system described in the above embodiments, and the resulting technical effects are the same as those in the above embodiments, and will not be repeated here.

[0091] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0092] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A leaf spring assembly, characterized in that, include: A first bracket (10) and a second bracket (20) are provided on the frame (4) at intervals along the front-rear direction of the vehicle. The first bracket (10) has an elongated hole (10a) extending in the front-rear direction of the vehicle. An adjusting device (30) is provided on the first bracket (10) and includes an eccentric cam bolt (31). The eccentric cam bolt (31) has an eccentric cam portion (311) and a shaft portion (312) arranged in sequence. The shaft portion (312) is adapted to pass through the elongated hole (10a) and can selectively move along the length direction of the elongated hole (10a). A leaf spring (40) is provided on the front axle or the rear axle, and the two ends of the leaf spring (40) are respectively connected to the shaft body (312) and the second bracket (20).

2. The leaf spring assembly according to claim 1, characterized in that, The first bracket (10) includes a top plate (11) and side plates (12) that are connected to both sides of the width of the top plate (11) and extend away from the frame (4). Each of the two side plates (12) has a limiting member (13) on the side opposite to each other. Each of the two limiting members (13) has the elongated hole (10a) and defines a limiting cavity. The eccentric cam portion (311) is rotatably disposed in the limiting cavity of the limiting member (13) on one of the side plates (12) so as to selectively drive the shaft portion (312) to move along the length direction of the elongated hole (10a).

3. The leaf spring assembly according to claim 2, characterized in that, The adjusting device (30) further includes a locking nut (32), which is adapted to be located on the side of the other side plate (12) where the limiting member (13) is provided, and to be threadedly engaged with the end of the shaft part (312) away from the eccentric cam part (311) to restrict the movement of the shaft part (312).

4. The leaf spring assembly according to claim 3, characterized in that, Also includes: An eccentric cam (33) is sleeved on the outer periphery of the shaft portion (312) and housed in the limiting cavity of the limiting member (13) on another side plate (12), and is located between the anti-loosening nut (32) and the side plate (12).

5. The leaf spring assembly according to claim 4, characterized in that, The shaft portion (312) includes a first shaft segment (3121) and a second shaft segment (3122) disposed axially away from the eccentric cam portion (311). The shaft diameter of the first shaft segment (3121) is larger than that of the second shaft segment (3122), and the second shaft segment (3122) is adapted to cooperate with the eccentric cam member (33) and the anti-loosening nut (32).

6. The leaf spring assembly according to claim 5, characterized in that, The outer periphery of the second shaft segment (3122) has at least one axially extending groove (3122a), the eccentric cam member (33) has a through hole (331), the through hole (331) is adapted for the second shaft segment (3122) to pass through, and the inner wall of the through hole (331) is provided with protrusions (332) corresponding one-to-one with the groove (3122a), each of the protrusions (332) being adapted to extend into the corresponding groove (3122a).

7. The leaf spring assembly according to claim 4, characterized in that, The eccentric cam portion (311) and / or the eccentric cam member (33) have a plurality of scale line holes (30a) spaced apart in the circumferential direction, one end of each scale line hole (30a) defining a scale line, and the limiting member (13) includes: A body plate (131) is connected to the side plate (12) and has the elongated hole (10a); End plates (132) are disposed at both ends of the body plate (131) in the vehicle front-rear direction and extend away from the side plate (12). The two end plates (132) are adapted to abut against the outer peripheral surface of the eccentric cam portion (311) or the outer peripheral surface of the eccentric cam member (33). An indicator plate (133) is disposed on one side of the body plate (131), and one side of the indicator plate (133) defines an indicator vertical line (133a), which is adapted to be displayed in the scale hole (30a) to indicate the corresponding scale line.

8. The leaf spring assembly according to claim 1, characterized in that, The single-stroke travel of the shaft part (312) within the elongated hole (10a) is L, and satisfies: 4mm≤L≤8mm.

9. A suspension system, characterized in that, include: A first leaf spring assembly and a second leaf spring assembly are opposite each other in the left-right direction of the vehicle, and at least one of them is configured as the leaf spring assembly according to any one of claims 1 to 8.

10. A vehicle, characterized in that, include: The suspension system as described in claim 9.

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