阅读说明：本技术 一种横置板簧的刚度可调悬架 (Rigidity-adjustable suspension of transverse plate spring ) 是由 张良 郑敏毅 韩帅 汪军 唐伊丽 王康 孙克 于 2020-06-03 设计创作，主要内容包括：本发明涉及一种横置板簧的刚度可调悬架,包括板簧和套设在所述板簧上的至少两个第一板簧刚度调节组件,其特征在于还包括至少一个第二板簧刚度调节组件,所述第二板簧刚度调节组件通过与至少一个第一板簧刚度调节组件相连接而抵接在所述板簧的板面上,其中,通过所述第一板簧刚度调节组件与所述第二板簧刚度调节组件相配合,所述板簧可以在至少三种刚度调节模式间转换,不同刚度调节模式下的板簧的板簧曲率与板簧可自由摆动臂长彼此独立调节或相互耦合调节。(The invention relates to a rigidity-adjustable suspension of a transverse plate spring, which comprises a plate spring and at least two first plate spring rigidity adjusting assemblies sleeved on the plate spring, and is characterized by also comprising at least one second plate spring rigidity adjusting assembly, wherein the second plate spring rigidity adjusting assembly is connected with at least one first plate spring rigidity adjusting assembly and is abutted against the plate surface of the plate spring, the plate spring can be switched among at least three rigidity adjusting modes by matching the first plate spring rigidity adjusting assembly with the second plate spring rigidity adjusting assembly, and the plate spring curvature and the free swinging arm length of the plate spring in different rigidity adjusting modes are adjusted independently or in a mutually coupled mode.)

1. A rigidity-adjustable suspension of a transverse plate spring comprises a plate spring (5) and at least two first plate spring rigidity adjusting components (12) sleeved on the plate spring (5),

it is characterized in that

The leaf spring stiffness adjusting mechanism is characterized by further comprising at least one second leaf spring stiffness adjusting assembly (13), wherein the second leaf spring stiffness adjusting assembly (13) is connected with at least one first leaf spring stiffness adjusting assembly (12) to abut against the plate surface of the leaf spring (5), the leaf spring (5) can be switched among at least three stiffness adjusting modes through the cooperation of the first leaf spring stiffness adjusting assembly (12) and the second leaf spring stiffness adjusting assembly (13), and the leaf spring curvature and the leaf spring free-swinging arm length of the leaf spring (5) in different stiffness adjusting modes are adjusted independently or in a mutually coupled mode.

2. Stiffness adjustable suspension according to claim 1, wherein the second leaf spring stiffness adjustment assembly (13) comprises at least one profiled roller (14) arranged on the first leaf spring stiffness adjustment assembly (12), a first adjustable spacing for connecting the leaf springs (5) remaining between each two profiled rollers (14), the first adjustable spacing being adaptable to different leaf spring curvature changes in at least one stiffness adjustment mode based on a relative initial position relationship and/or relative rotation between the two profiled rollers (14).

3. The stiffness tunable suspension according to claim 2, wherein the stiffness tunable suspension further comprises a rail driving mechanism (15), the first leaf spring stiffness adjusting assemblies (12) are mounted on the rail driving mechanism (15), and under forward and reverse driving of the rail driving mechanism (15), every two first leaf spring stiffness adjusting assemblies (12) simultaneously move along a longitudinal direction of the rail driving mechanism (15), so that a second tunable interval between every two first leaf spring stiffness adjusting assemblies (12) can be adapted to a free-swinging arm length change of different leaf springs in at least one stiffness tuning mode.

4. Stiffness tunable suspension according to claim 3, further comprising a stiffness tuning pattern analysis module (16) connected to a vehicle steering system (17), wherein,

the vehicle driving system (17) may collect one or more of vehicle driving data, environmental data and load data via a number of sensors,

the stiffness adjustment mode analysis module (16) comprises one or more of a road condition change detection unit (18), a load change detection unit (19), a load inertia change detection unit (20), a vehicle running rate detection unit (21) and a wheel contact detection unit (22), and the stiffness adjustment mode analysis module (16) analyzes based on the vehicle running data, the environmental data and the load data in combination with prestored mode conversion determination conditions to determine at least one stiffness adjustment mode.

5. The stiffness-adjustable suspension according to claim 4, wherein one or more of the road condition change detection unit (18), the load inertia change detection unit (20), the vehicle driving rate detection unit (21) and the wheel contact detection unit (22) respectively calculate first data, second data, third data and fourth data according to one or more of the acquired vehicle driving data, environmental data and load data, and the stiffness adjustment mode analysis module (16) processes the first data, the second data and the fourth data to determine at least one stiffness adjustment mode.

6. The stiffness adjustable suspension according to claim 5, wherein the stiffness adjustable suspension further comprises a load change detection unit (19) for acquiring fifth data, the load inertia change detection unit (20) is used for determining a load application object according to the current vehicle usage type, determining the distribution of the load application object in the vehicle according to the fifth data acquired by the load change detection unit (19) in an initialization period, and pre-judging second data based on the distribution of the load application object and the load application object in the vehicle, wherein the second data is related to the load change of the leaf spring (5) caused by load in the vehicle driving process.

7. The stiffness tunable suspension according to claim 6, wherein each stiffness tuning mode in the mode switching determination condition corresponds to a different feature set, and the stiffness tuning mode analyzing module (16) determines at least one stiffness tuning mode by processing the first to fourth data to extract the feature set.

8. The stiffness tunable suspension of claim 7, wherein the specific gravity of the leaf spring curvature and the free-swinging arm length of the leaf spring to the stiffness of the leaf spring under different stiffness tuning modes is determined by the feature set so that they are tuned independently or coupled to each other.

9. A rigidity regulating method of a rigidity-adjustable suspension based on a transverse plate spring,

characterized in that the method comprises the following steps:

adjusting a first adjustable interval reserved between the two profiled rollers (14) and used for connecting the leaf spring (5) based on the relative initial position relation and/or the relative rotation between the two profiled rollers (14), so that the first adjustable interval is suitable for different leaf spring curvature changes in at least one rigidity adjusting mode;

under the forward and reverse driving of the guide rail driving mechanism (15), every two first plate spring rigidity adjusting assemblies (12) simultaneously move along the longitudinal direction of the guide rail driving mechanism (15), so that a second adjustable interval between every two first plate spring rigidity adjusting assemblies (12) can adapt to the freely-swinging arm length change of different plate springs in at least one rigidity adjusting mode;

the first plate spring stiffness adjusting assembly (12) is matched with the second plate spring stiffness adjusting assembly (13), the plate spring (5) can be switched among at least three stiffness adjusting modes, and the plate spring curvature and the plate spring free-swinging arm length of the plate spring (5) in different stiffness adjusting modes are adjusted independently or in a mutually coupled mode.

10. A suspension experiment building platform with adjustable rigidity comprises a large frame (23), a small frame (24) and a plate spring (5), wherein the plate spring (5) spans in the small frame (24),

it is characterized in that

The upper and lower two of little frame (24) bear and connect the terminal surface and erect respectively and simulate bearing platform (25) and actuating mechanism, actuating mechanism is last to be equipped with and to be used for the cover to establish and connect at least one leaf spring rigidity adjusting part of leaf spring (5), wherein, is driving little frame (24) are followed big frame (23) support body controllable formula slides for when simulation bearing platform (25) change to the load parameter that leaf spring (5) applyed, accessible actuating mechanism's positive and negative drive changes the adjustable clearance between two at least leaf spring rigidity adjusting part, in order to reach the adaptability of leaf spring rigidity is adjusted.

Technical Field

The invention relates to the technical field of vehicle suspension systems, in particular to a rigidity-adjustable suspension with a transverse plate spring.

Background

The application of the transverse plate spring on the existing automobile is relatively less than that of the longitudinal plate spring, and the automobile using the transverse plate spring system mostly adopts a hard point fixing structure for the mounting and fixing mode of the transverse plate spring, the rigidity is not adjustable, so that the development of parts in the trial-manufacturing stage of a sample automobile can generate huge development cost, the cost is increased, and the special shape is customized by a plurality of plate springs, so that the development cost of a mold is increased. Meanwhile, the two ends of the plate spring and the swing arm connecting piece are mainly made of rubber, rubber is easy to age, the service life is short, the property is easy to change, and the environment can be polluted.

Disclosure of Invention

Aiming at the problem that the rigidity of the currently universal hard point fixed plate spring is not adjustable in the field, the prior art provides a transverse plate spring mounting structure with adjustable rigidity according to the patent, wherein the transverse plate spring mounting structure mainly drives the pulley seats on two sides to move towards two sides, and the pulleys gradually press the plate spring to be attached to an upper cross beam, so that the curvature of the plate spring and the free swing arm of the plate spring can be reduced simultaneously, and the rigidity is improved. However, in such a structure, the curvature of the plate spring and the free swing arm of the plate spring can only be synchronously adjusted, so that the small-amplitude regulation and control can cause large change of the rigidity of the plate spring, the adjustment sensitivity is poor, and the plate spring cannot adapt to different rigidity requirements under different driving conditions; meanwhile, because the independent control of the rigidity and the balance position cannot be realized, when the rigidity of the plate spring is adjusted each time, a larger load must be applied to the plate spring to increase or reduce the curvature of the plate spring, the plate spring is frequently strained, the fatigue life of the plate spring is shortened, and the long-term use of the plate spring is not facilitated.

In view of the above, the present invention provides a stiffness-adjustable suspension of a transverse leaf spring that realizes at least three stiffness adjustment modes by the cooperation of at least two leaf spring stiffness adjustment assemblies, the optimal rigidity adjusting mode which best accords with the current vehicle speed and the road condition to be faced can be determined by detecting and analyzing the road condition change, the load inertia change, the vehicle running speed and the wheel grounding condition of the current vehicle in multiple aspects through the rigidity adjusting mode analyzing module, so that the first leaf spring rigidity adjusting component and the second leaf spring rigidity adjusting component are matched with each other, the rigidity and the balance position can be independently controlled, the curvature of the plate spring and the free swing arm of the plate spring can be synchronously or asynchronously adjusted, the impact resistance and the flexible dynamic characteristic are good, and the device can adapt to the continuously changing speed and road conditions during actual running. Meanwhile, the rigidity and the balance position can be independently controlled, so that the position of a supporting point of the plate spring can be only adjusted when the rigidity of the plate spring is adjusted every time, the plate spring does not need to be stressed to change the curvature, namely, the problem that the fatigue life of the plate spring is reduced due to frequent adjustment of the rigidity of the plate spring is avoided to the minimum degree, the long-term use of the plate spring is facilitated, and the maintenance cost is reduced.

The invention provides a rigidity-adjustable suspension of a transverse plate spring, which comprises a plate spring and at least two first plate spring rigidity adjusting assemblies sleeved on the plate spring, and is characterized by also comprising at least one second plate spring rigidity adjusting assembly, wherein the second plate spring rigidity adjusting assembly is connected with at least one first plate spring rigidity adjusting assembly and is abutted against the plate surface of the plate spring, the plate spring can be switched among at least three rigidity adjusting modes through the matching of the first plate spring rigidity adjusting assembly and the second plate spring rigidity adjusting assembly, and the plate spring curvature of the plate spring in different rigidity adjusting modes and the free swinging arm length of the plate spring can be adjusted independently or in a mutually coupled mode.

Through the cooperation of the first plate spring rigidity adjusting assembly and the second plate spring rigidity adjusting assembly, the driving working conditions of different plate spring rigidity adjustment needs can be switched among at least three rigidity adjusting modes, namely the plate spring rigidity is changed by independently adjusting the curvature of the plate spring, the plate spring rigidity is changed by independently adjusting the free swinging arm length of the plate spring, and the plate spring rigidity is changed by coupling the plate spring curvature and the free swinging arm length of the plate spring. Under the arrangement, the rigidity-adjustable suspension provided by the invention can realize independent control of rigidity and balance position, can select the curvature of the plate spring and the free swing arm of the plate spring to be synchronously or asynchronously adjusted, and has good impact resistance and flexible dynamic characteristics. Especially, under the rigidity adjusting mode that the two modes are asynchronous adjustment, the adjusting amplitude is equivalent to the adjusting amplitude between the rigidity of the plate spring, the adjusting sensitivity is excellent, and the rigidity adjusting device can be well suitable for different rigidity requirements under different driving working conditions. In addition, because the realization of the rigidity and the balance position can be independently controlled, when the rigidity of the plate spring is adjusted each time, the position of the fulcrum of the plate spring can be only adjusted, and the plate spring does not need to be stressed to change the curvature, namely, the problem of the reduction of the fatigue life of the plate spring caused by the frequent adjustment of the rigidity of the plate spring is avoided to the minimum degree, the long-term use of the plate spring is facilitated, and the maintenance cost is reduced.

According to a preferred embodiment, the second leaf spring stiffness adjustment assembly comprises at least one profiled roller provided on the first leaf spring stiffness adjustment assembly, a first adjustable spacing for connecting the leaf springs being reserved between each two profiled rollers, the first adjustable spacing being adaptable to different leaf spring curvature changes in at least one stiffness adjustment mode based on a relative initial position relationship and/or relative rotation between the two profiled rollers.

The conventional light automobile usually adopts few leaf springs, the few leaf springs are formed by overlapping a plurality of steel plates which are thin at two ends and thick in the middle and have the same width and the same length, and the few leaf springs are characterized in that the steel plates become thinner gradually from the center to the two ends along the length direction, and for the few leaf springs which are widely applied, the automobile transverse leaf spring suspension system with continuously adjusted rigidity, which is proposed by the patent document with the publication number of CN110549806A in the prior art, can really achieve the purpose of adjusting the rigidity of the leaf spring, but the clamping space of the pulley seat is fixed, so that the application of the pulley seat is only limited to a single leaf spring with uniform thickness of the steel plates, the pulley seat cannot be practically applied to the few leaf springs which are widely applied, and the application object is. In contrast, the rigidity-adjustable suspension provided by the invention adopts the special-shaped roller group as the second plate spring rigidity adjusting component. Cam-type profiled rollers are important fittings of valve train systems in the art, which are typically applied individually to reciprocating linear or oscillating mechanisms. In the invention, however, every two rollers are combined into a group to form the special-shaped roller group. The novel characteristic of adjustable interval formed after two-by-two combination is utilized, the rigidity adjustment of a single plate spring with consistent thickness and a few plate springs with variable thickness can be simultaneously met, and the rigidity adjustment device is combined with another plate spring rigidity adjustment component and is not limited to a traditional single rigidity adjustment mode. Under the combined action of the two types of leaf spring rigidity adjusting components, the rigidity-adjustable suspension provided by the invention has at least three rigidity adjusting modes. The conversion among the rigidity adjusting modes promotes the adjusting sensitivity of the rigidity of the plate spring, and the fatigue life of the plate spring can be protected to the maximum extent while the plate spring is well adapted to different rigidity requirements under different driving working conditions.

According to a preferred embodiment, the stiffness-adjustable suspension further comprises a rail drive mechanism, the first leaf spring stiffness adjusting assemblies are assembled on the rail drive mechanism, and under the forward and reverse driving of the rail drive mechanism, every two first leaf spring stiffness adjusting assemblies simultaneously move along the longitudinal direction of the rail drive mechanism, so that the second adjustable interval between every two first leaf spring stiffness adjusting assemblies can adapt to the freely-swinging arm length change of different leaf springs in at least one stiffness adjusting mode.

In the present application, the guide rail driving mechanism adopts a rack and pinion type transmission structure, and is different from a transverse leaf spring suspension system of an automobile, which is generally adopted in the prior art and proposed in patent document with publication number CN110549806A, in the existing scheme, a lead screw transmission is generally adopted to realize position adjustment of a pulley seat, however, the lead screw transmission will cause transmission clearance to become large under long-term use, return stroke precision to become poor, and reliable and accurate adjustment cannot be realized. On the other hand, the driving mechanism has the advantages that the structure of the driving mechanism and the relative position relation between the driving mechanism and the plate spring are optimized, and the rack, the plate spring rigidity adjusting component and the plate spring in the driving mechanism are basically positioned on the same working plane, so that the whole structure of the driving mechanism is compact, the gravity center position is lower, the occupied space of the driving mechanism can be reduced, and the driving stability of a vehicle can be improved.

According to a preferred embodiment, the stiffness-adjustable suspension further comprises a stiffness adjustment mode analysis module connected to the vehicle driving system, wherein the vehicle driving system can acquire one or more of vehicle driving data, environment data and load data through a plurality of sensors, the stiffness adjustment mode analysis module comprises one or more of a road condition change detection unit, a load inertia change detection unit, a vehicle driving rate detection unit and a wheel contact detection unit, and the stiffness adjustment mode analysis module analyzes based on the vehicle driving data, the environment data and the load data and in combination with a prestored mode conversion determination condition to determine at least one stiffness adjustment mode.

In the actual driving process of the vehicle, the speed and the driving road condition are constantly changed, the vehicle is required to have driving safety and riding comfort, and the rigidity regulation and control mode of the vehicle suspension system plays a crucial role in the performance of the suspension and directly influences the operation stability, riding comfort and driving safety of the vehicle. In contrast, in a conventional automotive transverse leaf spring suspension system proposed in patent document CN110549806A, when a sensor detects that the sprung mass changes due to a difference in the number of passengers, a suspension system controller adjusts the stiffness of the suspension system accordingly based on load data acquired by a pressure sensor. The scheme can only adjust proper suspension rigidity according to static load, cannot adapt to the continuously-changed vehicle speed and road conditions during actual driving, the spring load mass continuously changes during the driving process, the suspension system can only adjust with hysteresis, the adjusting frequency is high, the leaf spring is frequently strained, the fatigue life of the leaf spring is shortened, and the long-term use of the leaf spring is not facilitated. Therefore, the rigidity-adjustable suspension is provided with a rigidity adjusting mode analysis module on the adjustable structure of the plate spring rigidity adjusting component, and the optimal rigidity adjusting mode which best meets the current vehicle speed and the road condition to be faced can be determined by detecting and analyzing the road condition change, load inertia change, vehicle driving speed and wheel grounding condition of the current vehicle in many aspects, so that the suspension under the mutual matching of the first plate spring rigidity adjusting component and the second plate spring rigidity adjusting component has good impact resistance and flexible dynamic characteristics, and is suitable for the vehicle speed and road condition which are constantly changed during actual driving. The rigidity adjusting mode analysis module analyzes the front road condition, so that the problem of hysteretic adjustment in the prior art does not exist, and in a driving state with high rigidity adjusting frequency requirement, the rigidity adjusting mode is automatically switched to a mode of independently adjusting the free swinging arm length of the plate spring without frequent strain of the plate spring, so that the fatigue life of the plate spring can be effectively prolonged.

According to a preferred embodiment, one or more of the road condition change detection unit, the load inertia change detection unit, the vehicle driving rate detection unit and the wheel contact detection unit respectively calculate first data, second data, third data and fourth data according to one or more of the acquired vehicle driving data, environment data and load data, and the stiffness adjustment mode analysis module processes the first data, the second data, the environment data and the load data and then determines at least one stiffness adjustment mode.

According to a preferred embodiment, the stiffness-adjustable suspension further comprises a load change detection unit for acquiring fifth data, the load inertia change detection unit is used for determining a load application object according to the current vehicle usage type, determining the distribution condition of the load application object in the vehicle according to the fifth data acquired by the load change detection unit in an initialization time period, and pre-judging second data based on the distribution condition of the load application object and the load application object in the vehicle, wherein the second data is related to the load change of the leaf spring caused by load during the vehicle driving process.

The load inertia change detection unit is related to a load application object in the current vehicle, wherein the vehicle is mainly used in small and medium-sized cars and medium-sized and small-sized transport vehicles, namely the load application object can be passengers, solid-state objects and liquid-state objects. For different load applying objects, the inertia of the objects, namely the ability of keeping a static state under the action of external force, is different, and the inertia of the load applying objects in the vehicle seriously influences the load condition of the suspension. Therefore, the load applying object in the vehicle is pre-collected to pre-judge the influence condition of the inertia size on the suspension load, so that the rigidity adjusting requirement can better fit the actual running condition, the load inertia change is combined with other multiple influence factors, the operation process of mode conversion judgment can be rapidly processed and completed through a characteristic extraction mode, and the system is high in response speed and reliability.

According to a preferred embodiment, each stiffness adjustment mode in the mode conversion determination condition corresponds to a different feature set, and the stiffness adjustment mode analysis module determines at least one stiffness adjustment mode by processing the first to fourth data to extract the feature set. Through the modes of feature extraction and mode conversion judgment, the traditional method of a single rigidity adjusting mode is abandoned, and on the basis that the establishment of a feature description set and the matching of the feature set can be completed quickly, the suspension system with multiple rigidity adjusting modes is realized, and the suspension system is high in response speed and reliability.

According to a preferred embodiment, the adjustment ratio of the curvature of the leaf spring and the free pivoting arm length of the leaf spring to the stiffness of the leaf spring in the different stiffness adjustment modes is determined by the characteristic set in such a way that they are adjusted independently of one another or are adjusted in a coupled manner to one another.

The invention also provides a rigidity regulating method of the rigidity-adjustable suspension based on the transverse plate spring, which is characterized by comprising the following steps of: adjusting and controlling a first adjustable interval reserved between the two special-shaped rollers and used for connecting the leaf spring based on the relative initial position relation and/or the relative rotation between the two special-shaped rollers, so that the first adjustable interval is suitable for different leaf spring curvature changes in at least one rigidity adjusting mode; under the forward and reverse driving of the guide rail driving mechanism, every two first plate spring rigidity adjusting assemblies simultaneously move along the longitudinal direction of the guide rail driving mechanism, so that a second adjustable interval between every two first plate spring rigidity adjusting assemblies can adapt to the change of the free swinging arm length of different plate springs under at least one rigidity adjusting mode; the first plate spring rigidity adjusting assembly is matched with the second plate spring rigidity adjusting assembly, the plate spring can be switched among at least three rigidity adjusting modes, and the plate spring curvature and the free swinging arm length of the plate spring in different rigidity adjusting modes are adjusted independently or in mutual coupling mode.

The rigidity of the plate spring during no-load/full-load is respectively corresponding to the front axle load during no-load/full-load, the difference of the smoothness of the vehicle during no-load and full-load is small, and the smoothness of the empty and full load is good. The elastic element/leaf spring of the independent suspension is hidden in the cross beam of the auxiliary frame, so that the structure is compact, and the occupied space is reduced. The elastic element used by the independent suspension is simple in structure, mature in process, easy to manufacture and low in production cost. The independent suspension is simple in overall structure, convenient to maintain and repair and low in maintenance cost. The problem of current commercial car rear suspension one side single elastic element, the ride comfort when no-load and full load differs too much is solved. The problem that the load capacity of the conventional independent suspension is small is solved, and the requirement of a large-axle load commercial vehicle can be met.

The invention also provides a suspension experiment building platform with adjustable rigidity, which comprises a large frame, a small frame and a plate spring, wherein the plate spring stretches across the small frame, and the suspension experiment building platform is characterized in that a simulation bearing table and a driving mechanism are respectively erected on the upper and lower bearing end faces of the small frame, and at least one plate spring rigidity adjusting assembly for sleeving and connecting the plate spring is assembled on the driving mechanism, wherein the small frame is driven to controllably slide along the large frame body, so that when the load parameters applied to the plate spring by the simulation bearing table are changed, the adjustable gap between at least two plate spring rigidity adjusting assemblies can be changed through forward and reverse driving of the driving mechanism, and the adaptive adjustment of the plate spring rigidity is achieved.

When a rigidity adjusting experiment is carried out, the weight and the arrangement position of an object on the simulation bearing platform are changed, and the size and the load distribution of the load applied to the plate spring can be adjusted and controlled; the small frame is controlled to slide up and down along the large frame body, so that the load applied by the simulation bearing table to the plate spring can be converted between static load and alternating load, and the performance of the plate spring can be simulated and analyzed; through the forward and reverse driving of different driving mechanisms, the adjustable gaps among the plurality of plate spring rigidity adjusting assemblies can be changed, the adjustable gaps directly influence the plate spring curvature of the plate spring and the free swinging arm length of the plate spring, and therefore the rigidity of the plate spring can be adjusted in the test in an adaptive manner, and the optimization solution scheme under different driving conditions can be researched.

Drawings

FIG. 1 is a simplified overall structure diagram of a suspension experiment building platform provided by the invention;

FIG. 2 is a simplified modular connection diagram of the adjustable stiffness suspension provided by the present invention;

FIG. 3 is a simplified overall schematic diagram of the leaf spring stiffness adjustment assembly provided by the present invention; and

fig. 4 is a simplified overall structural schematic diagram of the second leaf spring stiffness adjusting assembly in embodiment 1 provided by the present invention.

List of reference numerals

1: the rear gearwheel 2: front big gear

3: rear rack 4: vehicle body

5: the plate spring 6: driven pinion

7: connecting shaft 8: driving pinion

9: a motor shaft 10: front rack

11: lock member 12: first leaf spring rigidity adjustment assembly

13: second leaf spring rigidity adjusting assembly 14: special-shaped roller

15: rail drive mechanism 16: rigidity adjustment mode analysis module

17: vehicle driving system 18: road condition change detection unit

19: load change detection unit 20: load inertia change detection unit

21: vehicle travel rate detection unit 22: wheel grounding detection unit

23: the large frame 24: small frame

25: simulation bearing platform 111: welding block

112: the guide rail slide block 113: roller

114: roller shaft

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.