Air suspension system, vehicle chassis and new energy working vehicle

Abstract

The application relates to the field of working machines, discloses an air suspension system, a vehicle chassis and a new energy working vehicle, and the air suspension system and the vehicle chassis can be applied to not only the new energy working vehicle but also a fuel working vehicle, wherein the air suspension system comprises: a guide arm assembly used for supporting an axle and movably connected to the bottom of a vehicle frame; an air spring assembly used for connecting the vehicle frame and the guide arm assembly and comprising an air spring body and a built-in limiting structure arranged in the air spring body; and an external limiting structure used for being arranged at the bottom of the vehicle frame and above the axle, the downward extension length of the external limiting structure at the bottom of the vehicle frame is adjustably arranged, so that the maximum upward jump stroke of the axle can be limited by the external limiting structure and / or the built-in limiting structure. The application can effectively prolong the service life of the air spring assembly, balance the axle loads of the whole vehicle, and improve the driving passability, smoothness and comfort of the whole vehicle under different road conditions.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of working machines, and particularly relates to an air suspension system, a vehicle chassis and a new energy working vehicle. BACKGROUND

[0002] The rear axle of the existing multi-axle driving steering working vehicle (such as a new energy working vehicle including a new energy crane, a fuel working vehicle including a fuel crane, etc.) is usually supported by a leaf spring suspension, and each axle is matched with a set of leaf spring suspensions. However, at present, due to the height limitation of the whole vehicle, the arrangement space of the leaf spring suspension is small, and the upstroke height of the leaf spring suspension is limited, which affects the passing performance of the whole vehicle. At the same time, in order to meet the bearing requirements, the stiffness of the leaf spring of the leaf spring suspension is generally large, which causes the damping performance of the leaf spring suspension to decrease, resulting in poor ride comfort and smoothness of the whole vehicle. In addition, the axle load distribution of the multi-axle is not uniform and is not easy to adjust due to the influence of the leaf spring arc height error and various factors. SUMMARY

[0003] The purpose of the present application is to provide an air suspension system, a vehicle chassis and a new energy working vehicle, which can effectively balance the axle load of the whole vehicle, and at the same time improve the passing performance, smoothness and comfort of the whole vehicle under different road conditions.

[0004] In order to achieve the above-mentioned purpose, the present application provides an air suspension system in one aspect, which comprises:

[0005] A guide arm assembly for supporting an axle and being movably connected to the bottom of a vehicle frame;

[0006] An air spring assembly for connecting the vehicle frame and the guide arm assembly, and comprising an air spring body and an internal limiting structure arranged in the air spring body; and

[0007] An external limiting structure arranged on the bottom of the vehicle frame and above the axle, wherein the downward extension length of the external limiting structure on the bottom of the vehicle frame is adjustably arranged, so that the maximum upstroke stroke of the axle can be limited by the external limiting structure and / or the internal limiting structure.

[0008] In some embodiments, one end of the guide arm assembly is formed as a hinged end for being hinged to the vehicle frame, and the other end is formed as a swing end capable of swinging up and down. In the direction from the hinged end to the swing end, the bottom end surface of the external limiting structure is formed as an upwardly inclined inclined limiting surface, which is used for limiting the upstroke of the axle.

[0009] In some embodiments, the external limiting structure comprises:

[0010] A limiting strut for being fixed on the bottom of the vehicle frame and arranged in the up-down direction.

[0011] a limiting support, sleeved on the limiting support column and capable of moving along the axial direction of the limiting support column;

[0012] a locking member for locking or unlocking the limiting support and the limiting support column;

[0013] a buffer member connected to the bottom of the limiting support and used for limiting the abutment of the upper jump of the axle.

[0014] In some embodiments, one end of the guide arm assembly is formed as a hinged end for being hinged to the vehicle frame and the other end is formed as a swing end capable of swinging up and down, the air spring assembly is arranged at the swing end, and the external limiting structure is located between the air spring assembly and the hinged end.

[0015] The second aspect of the present application further provides a vehicle chassis, which comprises:

[0016] a vehicle frame;

[0017] an axle arranged below the vehicle frame; and

[0018] the air suspension system as described above.

[0019] In some embodiments, the axle comprises a steering axle, and the vehicle chassis further comprises a mechanical steering mechanism, which comprises:

[0020] a fixed seat body fixed to the lateral side of the vehicle frame and provided with an axially extending shaft body;

[0021] a steering rocker arranged in the up-down direction and rotatably connected to the shaft body;

[0022] a steering knuckle arm for being fixedly connected to a steering knuckle and a wheel hub of the steering axle, and the steering knuckle arm is arranged in the lateral direction;

[0023] a first connecting rod arranged in the front-rear direction, one end of the first connecting rod is hinged to the upper end of the steering rocker, and the other end is used for forming a mechanical transmission connection with a steering wheel;

[0024] a second connecting rod arranged in the front-rear direction, both ends of the second connecting rod are respectively hinged to the steering knuckle arm and the lower end of the steering rocker.

[0025] In some embodiments, the guide arm assembly is arranged in the front-rear direction and one end is formed as a hinged end hinged to the vehicle frame, and the hinged point of the second connecting rod and the steering rocker is arranged adjacent to the hinged end.

[0026] In some embodiments, the knuckle arm comprises an outer arm segment and an inner arm segment, the outer arm segment is used to be fixedly connected with the knuckle of the steering bridge and the wheel hub, the inner arm segment has a height lower than that of the outer arm segment, and the inner arm segment is hingedly connected with one end of the second connecting rod which has a height lower than that of the inner arm segment.

[0027] In some embodiments, the vehicle chassis is provided with a plurality of the steering bridges, and the air suspension system is arranged between the vehicle frame and the steering bridge with the smallest steering angle range.

[0028] In some embodiments, the vehicle frame is a box-type vehicle frame, and the vehicle chassis further comprises an inner built-in lateral stabilizing structure arranged in the lateral direction in the box-type vehicle frame, and the lateral ends of the inner built-in lateral stabilizing structure are respectively connected to the middle part of the vehicle bridge and the lateral inner side wall of the box-type vehicle frame.

[0029] In some embodiments, the inner built-in lateral stabilizing structure comprises:

[0030] a first support fixed to the lateral inner side wall of the box-type vehicle frame;

[0031] a second support fixed to the middle part of the vehicle bridge;

[0032] a lateral stabilizing connecting rod, and the two ends of the lateral stabilizing connecting rod are respectively hingedly connected to the first support and the second support.

[0033] In some embodiments, the outer wall of the box-type vehicle frame is provided with a maintenance hole for maintaining the air suspension system and the inner built-in lateral stabilizing structure.

[0034] The third aspect of the present application further provides a new energy work vehicle comprising the vehicle chassis described above.

[0035] Through the above technical solutions, the air suspension system of the present application can select whether to use the external limiting structure or the internal limiting structure to limit the maximum up-jump stroke of the vehicle bridge by adjusting the downward protruding length of the external limiting structure at the bottom of the vehicle frame, which can effectively improve the driving performance of the whole vehicle under different road conditions, reduce the collision frequency of the internal limiting structure, and prolong the service life of the air spring assembly. In addition, compared with the existing leaf spring suspension, the air suspension system has small rigidity, can improve the damping performance while meeting the load capacity, and thus can effectively improve the driving smoothness and comfort of the whole vehicle. Furthermore, according to the characteristics of the air suspension system, it can balance the axle load of the whole vehicle by self-adjusting the air pressure of the air spring body, and effectively reduce the uneven distribution of the axle load of the whole vehicle.

[0036] Other features and advantages of the embodiments of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0037] The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and serve to explain them and necessarily should not be considered as limiting the embodiments of the application. Other embodiments of the application can be obtained from a combination of the drawings illustrated, without paying creative labor. In the drawings:

[0038] Figure 1 is a partial side view of a vehicle chassis in the embodiments of the application;

[0039] Figure 2 is a front view of the vehicle chassis in Figure 1

[0040] Figure 3 is a partial schematic view of Figure 1 , wherein in Figure 3 (a), the axle is not jumping up; in Figure 3 (b), the maximum up-jumping stroke of the axle is limited by an external limiting structure; in Figure 3 (c), the maximum up-jumping stroke of the axle is limited by an internal limiting structure;

[0041] Figure 4 is a schematic view of an external limiting structure in the embodiments of the application;

[0042] Figure 5 is a schematic view of another external limiting structure in the embodiments of the application;

[0043] Figure 6 is another partial schematic view of Figure 1

[0044] Figure 7 is a partial schematic view of Figure 2

[0045] Figure 8 is another partial schematic view of Figure 1

[0046] Figure 9 is another partial schematic view of Figure 2

[0047] Explanation of reference signs

[0048] 1 guide arm assembly 2 air spring assembly

[0049] 3 external limiting structure 4 fixed seat body

[0050] 5 steering rocker arm 6 steering knuckle arm

[0051] ​​​​​7 first connecting rod 8 second connecting rod

[0052] 9 built-in lateral stabilizing structure 10 vehicle frame

[0053] 11 axle

[0054] 21 air spring body 22 built-in limiting structure

[0055] 31 limiting support 32 limiting support base

[0056] 33 locking member 34 buffer member

[0057] 35 tilting limiting surface 61 outer arm segment

[0058] 62 inner arm segment 91 first support base

[0059] 92 second support base 93 lateral stabilizing connecting rod

[0060] 101 vehicle frame cover plate 102 vehicle frame web

[0061] 103 vehicle frame bottom plate 104 maintenance hole

[0062] 331 locking nut 332 locking clamp DETAILED DESCRIPTION

[0063] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0064] With reference to Figure 1 and Figure 3 , the first exemplary embodiment of the present application provides an air suspension system, which comprises a guide arm assembly 1, an air spring assembly 2 and an external limiting structure 3.

[0065] Specifically, the guide arm assembly 1 is used to support the axle 11 and is movably connected to the bottom of the vehicle frame 10. When the vehicle is running on a bumpy road, the axle 11 can drive the guide arm assembly 1 to jump up or down, while the vehicle body supported on the vehicle frame 10 will not follow the axle 11 to jump up or down, so as to maintain the stability of the vehicle body. It should be noted that the present application does not limit the up-and-down movement of the guide arm assembly 1, for example, the guide arm assembly 1 can be translated or swing up and down around a fixed point, etc., which are all within the scope of the present application.

[0066] The air spring assembly 2 connects the frame 10 and the guide arm assembly 1, and includes an air spring body 21 and a built-in limiting structure 22 disposed in the air spring body 21. When the axle 11 causes the guide arm assembly 1 to bounce up or down, the air spring body 21 can absorb shock and drive the axle 11 and the guide arm assembly 1 to return to their original positions. Figure 3 The state shown in (a), and referring to Figure 3 (c) The built-in limiting structure 22 can limit the maximum compression amplitude of the air spring body 21, thereby limiting the maximum upward travel of the axle 11. Compared with the existing leaf spring suspension, the air spring assembly 2 allows the axle 11 to have a larger upward and downward travel, so the air suspension system can better meet the driving safety and passability requirements of the work vehicle under complex working conditions.

[0067] However, considering that the work vehicle needs to deal with complex or even harsh road conditions from time to time, if the built-in limiting structure 22 is used to limit the upward travel of the axle 11 for a long time, it means that the built-in limiting structure 22 will frequently collide inside the air spring body 21 (see reference). Figure 3 (c) This will accelerate the damage rate of the built-in limiting structure 22, and its service life will be greatly shortened. Once the built-in limiting structure 22 is damaged, it will seriously affect driving safety, and in the short term after the damage, the only solution is to replace the entire air spring assembly 2.

[0068] To address the aforementioned issues, the air suspension system of this application also features an external limiting structure 3. This external limiting structure 3 is positioned at the bottom of the frame 10 and above the axle 11. The downward extension length of the external limiting structure 3 at the bottom of the frame 10 is adjustable. Users can adjust the downward extension length of the external limiting structure 3 based on actual road conditions and usage habits to determine whether to use the external limiting structure 3 or the internal limiting structure 22 to limit the maximum upward travel of the axle 11, thus determining the priority of using the external limiting structure 3 and the internal limiting structure 22.

[0069] When the vehicle is traveling on a highway or flat road, due to the smooth surface and good passability, the external limiting structure 3 can be used first to limit the maximum upward travel of the axle 11. (Refer to...) Figure 3(b), by adjusting the downward protruding length of the external limiting structure 3 at the bottom of the vehicle frame 10 to be longer, the external limiting structure 3 can be used to limit the abutment of the upjumping vehicle axle 11, and at this time, the internal limiting structure 22 does not form a collision inside the air spring body 21. In this way, by providing the external limiting structure 3, the collision frequency of the internal limiting structure 22 can be reduced, the service life of the air spring assembly 2 can be effectively prolonged, and even if the air spring assembly 2 is damaged, the driving safety of the whole vehicle can be ensured by using the external limiting structure 3, and the air spring assembly 2 does not need to be replaced in the short term.

[0070] When the whole vehicle is driving on complex or harsh road conditions such as mountain roads, in order to avoid single axle top dead, affecting the safety and passing performance of the whole vehicle, the internal limiting structure 22 can be used to limit the maximum upjumping stroke of the vehicle axle 11. Referring to Figure 3 (c), at this time, the downward protruding length of the external limiting structure 3 at the bottom of the vehicle frame 10 needs to be adjusted to be shorter, and when the vehicle axle 11 is at the maximum upjumping height, the external limiting structure 3 will not collide with the vehicle axle 11. In complex or harsh road conditions, the internal limiting structure 22 is used to limit the maximum upjumping stroke of the vehicle axle 11, which not only improves the passing performance and driving safety of the whole vehicle, but also avoids the frequent collision of the external limiting structure 3 with the vehicle axle 11, which protects the external limiting structure 3.

[0071] In addition, by adjusting the downward protruding length of the external limiting structure 3 at the bottom of the vehicle frame 10 to an appropriate length, the maximum upjumping height of the vehicle axle limited by the external limiting structure 3 can be equal to the maximum upjumping height of the vehicle axle limited by the internal limiting structure 22. In other words, when the vehicle axle 11 abuts with the external limiting structure 3, the internal limiting structure 22 just collides inside the air spring body 21, so that the external limiting structure 3 and the internal limiting structure 22 simultaneously limit the vehicle axle 11, at this time, the external limiting structure 3 and the internal limiting structure 22 can share the impact force borne by each other, thereby also achieving the effect of reducing the damage probability of the external limiting structure 3 and the internal limiting structure 22.

[0072] In summary, since the downward protruding length of the external limiting structure 3 at the bottom of the vehicle frame 10 can be adjusted, the maximum upjumping stroke of the vehicle axle 11 can be limited by the external limiting structure 3 and / or the internal limiting structure 22.

[0073] Through the above setting, the air suspension system of the present application can adjust the downward protruding length of the external limiting structure 3 at the bottom of the vehicle frame to select whether to use the external limiting structure 3 or the internal limiting structure 22 to limit the maximum upjumping stroke of the vehicle axle 11, which can effectively improve the driving passing performance of the whole vehicle under different road conditions, and reduce the collision frequency of the internal limiting structure 22, thereby prolonging the service life of the air spring assembly 2.

[0074] In addition, compared with the existing leaf spring suspension, the air suspension system has small rigidity, can improve the damping performance while meeting the bearing capacity, and thus can effectively improve the driving smoothness and comfort of the vehicle.

[0075] Furthermore, from the characteristics of the air suspension system, it can self-adjust the air pressure of the air spring body 21 to balance the axle load of each axle of the vehicle. For example, when the axle load of other axles is large and the axle load of the axle where the air suspension system is located is small, the air pressure of the air spring body 21 can be adjusted to balance the axle load of each axle of the vehicle, so that the air suspension system can effectively reduce the uneven distribution of the axle load of each axle of the vehicle.

[0076] In some embodiments, referring to Figures 3 to 5 , one end of the guide arm assembly 1 is formed as a hinged end for being hinged to the vehicle frame 10, and the other end is formed as a swing end capable of swinging up and down, that is, the up and down movement of the guide arm assembly 1 is swinging up and down. At this time, in order to match the movement law of the guide arm assembly 1, the bottom end surface of the external limiting structure 3 can be formed as an inclined limiting surface 35 inclined upward in the direction from the hinged end to the swing end of the guide arm assembly 1. When the jumped axle 11 is limited and abuts against the external limiting structure 3, the inclined limiting surface 35 can basically fit the top surface of the axle 11, thereby increasing the contact area between the two, weakening the impact, and reducing the risk of damage to the axle 11 and the external limiting structure 3.

[0077] In some embodiments, referring to Figure 4 and Figure 5 , the external limiting structure 3 can include a limiting support 31, a limiting support 32, a locking member 33, and a buffer 34. Specifically, the limiting support 31 is used to be fixed on the bottom of the vehicle frame 10 and arranged in the up and down direction, and the limiting support 32 is sleeved on the limiting support 31 and can move in the axial direction of the limiting support 31. The locking member 33 is used to lock or unlock the limiting support 32 and the limiting support 31. When the limiting support 32 and the limiting support 31 are locked, the limiting support 32 cannot move in the axial direction of the limiting support 31, and the two are fixed to each other. When the limiting support 32 and the limiting support 31 are unlocked, the limiting support 32 can move in the axial direction of the limiting support 31. In addition, the buffer 34 is connected to the bottom of the limiting support 32 and is used to limit and abut against the jumped axle 11, which can avoid the rigid collision between the external limiting structure 3 and the axle 11, thereby protecting the rigid components in the axle 11 and the external limiting structure 3. In addition, the bottom surface of the buffer 34 can be formed as the aforementioned inclined limiting surface 35.

[0078] When it is necessary to adjust the downward protruding length of the external limiting structure 3 on the bottom of the vehicle frame 10, the locking member 33 can be loosened first to unlock the limiting support 32 and the limiting support 31, and then the axial relative position of the limiting support 32 and the limiting support 31 is adjusted, so that the height of the buffer 34 can be adjusted.

[0079] For example, referring to Figure 4 , the locking member 33 can be a locking nut 331, at this time, the outer circumferential wall of the limiting support column 31 is provided with external threads, and the inner circumferential wall of the limiting support base 32 is provided with internal threads, so that the limiting support base 32 and the locking nut 331 can be threadedly connected with the limiting support column 31. By tightening or loosening the locking nut 331, the locking or unlocking of the limiting support column 31 and the limiting support base 32 can be achieved, and by adjusting the length of the threaded connection of the limiting support column 31 and the limiting support base 32, the axial relative position of the limiting support base 32 and the limiting support column 31 can be adjusted, so that the height of the buffer member 34 can be adjusted. And in Figure 4 the embodiment, the locking member 33 can also be replaced by a locking clamp 332, which can be referred to Figure 5 , at this time, the circumferential wall of the limiting support base 32 is slotted and the tightness is achieved by the locking clamp 332.

[0080] In some embodiments, referring to Figure 1 and Figure 3 , the air spring assembly 2 can be arranged at the swinging end of the guide arm assembly 1, and the external limiting structure 3 can be arranged between the air spring assembly 2 and the hinged end of the guide arm assembly 1, and correspondingly, in the whole vehicle, the axle 11 is also arranged between the air spring assembly 2 and the hinged end of the guide arm assembly 1, so that the axle 11 can limit the maximum upward stroke by abutting against the limiting of the external limiting structure 3 under some road conditions.

[0081] In addition, the second exemplary embodiment of the present application also provides a vehicle chassis, which comprises a vehicle frame 10, an axle 11 arranged below the vehicle frame 10, and the air suspension system described above. And the present application does not limit the specific type of the axle 11, for example, the steering axle (the steering axle mentioned herein includes a common steering axle and a steering drive axle), a drive axle, etc.

[0082] In some embodiments, referring to Figure 1 , Figure 2 , Figure 6 and Figure 7 , the axle 11 can include a steering axle (which can be a common steering axle or a steering drive axle), and the vehicle chassis can include a mechanical steering mechanism, which includes a fixed seat body 4, a steering rocker arm 5, a steering knuckle arm 6, a first connecting rod 7 and a second connecting rod 8.

[0083] Specifically, the fixed seat body 4 is fixed on the lateral side of the vehicle frame 10 and is provided with an axially extending shaft body, the steering rocker arm 5 is arranged in the up-down direction and is rotatably connected to the shaft body of the fixed seat body 4, the steering knuckle arm 6 is used to be fixedly connected with the steering knuckle and the wheel hub of the steering axle and is arranged in the lateral direction, and the first connecting rod 7 and the second connecting rod 8 are both arranged in the front-rear direction. In addition, one end of the first connecting rod 7 is hingedly connected to the upper end of the steering rocker arm 5 and the other end is used to form a mechanical transmission connection with the steering wheel of the whole vehicle, and the two ends of the second connecting rod 8 are respectively hingedly connected to the steering knuckle arm 6 and the lower end of the steering rocker arm 5.

[0084] When the driver rotates the steering wheel, the steering wheel can drive the first connecting rod 7 to move in the front-rear direction through the mechanical transmission structure, the first connecting rod 7 can drive the upper end of the steering rocker arm 5 to move, so that the steering rocker arm 5 as a whole can rotate around the shaft body of the fixed seat body 4, and the lower end of the steering rocker arm 5 can drive the second connecting rod 8 to move in the front-rear direction, the second connecting rod 8 can drive the steering knuckle arm 6 to swing, and at the same time drive the steering knuckle and the wheel hub of the steering axle to steer, so as to realize the steering of the wheels.

[0085] By contrast, the steering mechanism matched with the air suspension on the existing working vehicle mostly adopts electric control or electro-hydraulic proportional control, which has a complex structure, a high installation cost, and cannot realize mechanical steering when the control fails, and is generally only matched with the steering axle for use, which has poor universality. However, the mechanical steering mechanism of the present application has a simple structure and a low installation cost, and at the same time, the mechanical steering mechanism does not need to be connected to the control system, has no risk of being unable to steer when the control fails, and can be matched with the steering axle and the steering drive axle for use, which has stronger universality. In addition, the first connecting rod 7 and the second connecting rod 8 can be arranged in a substantially horizontal manner, are balanced in force, are not easy to deform and break, and have strong reliability and durability.

[0086] In some embodiments, with reference to Figure 8 , the guide arm assembly 1 is arranged in the front-rear direction and one end thereof is formed to be hingedly connected to the hinged end of the vehicle frame 10, and Figure 8 It can be seen that the hinged point C of the guide arm assembly 1 and the vehicle frame 10. In addition, the hinged point of the second connecting rod 8 and the steering rocker arm 5 is arranged adjacent to the hinged end of the guide arm assembly 1, that is, Figure 8 It can be seen that the hinged point D of the second connecting rod 8 and the steering rocker arm 5 is adjacent to the hinged point C of the guide arm assembly 1 and the vehicle frame 10.

[0087] Based on the above arrangement, as long as the second connecting rod 8 does not deform or break, the movement trajectory of the hinged point E of the steering knuckle arm 6 and the second connecting rod 8 relative to the hinged point D of the second connecting rod 8 and the steering rocker arm 5 is a circular arc with the hinged point D as the center and DE as the radius, that is, a first circular arc trajectory A, in other words, the first circular arc trajectory A is determined by the second connecting rod 8.

[0088] In addition, the rigidity of the guide arm assembly 1 is generally much greater than the rigidity of the air spring assembly 2. Therefore, when the guide arm assembly 1 swings up and down, the deformation of the guide arm assembly 1 is much smaller than the deformation of the air spring assembly 2, at this time, the axle 11 rotates around the hinge point C, and since the knuckle arm 6 is fixed with the knuckle and hub of the axle 11, the aforementioned hinge point E can be considered as fixed with the knuckle and hub of the axle 11, and the hinge point E can be considered as rotating around the hinge point C with the radius of CE, so as to form a second circular arc track B, in other words, the second circular arc track B is determined by the air suspension system.

[0089] It can be seen that, in the case that the hinge point D of the second connecting rod 8 and the steering rocker arm 5 is adjacent to the hinge point C of the guide arm assembly 1 and the vehicle frame 10, the first circular arc track A of the E point determined by the second connecting rod 8 is highly coordinated with the second circular arc track B of the E point determined by the air suspension system, so as to avoid the motion interference between the mechanical steering mechanism and the air suspension system, thereby ensuring that the wheels do not deviate during the driving of the whole vehicle, greatly improving the driving safety, and greatly reducing the risk of damaging the components due to the motion interference.

[0090] In order to make the hinge point D of the second connecting rod 8 and the steering rocker arm 5 adjacent to the hinge point C of the guide arm assembly 1 and the vehicle frame 10, an optional embodiment is that the knuckle arm 6 comprises an outer arm segment 61 and an inner arm segment 62, wherein the outer arm segment 61 is used for fixed connection with the knuckle and hub of the steering axle, the height of the inner arm segment 62 is lower than the height of the outer arm segment 61, the inner arm segment 62 is hinged with one end of the second connecting rod 8, and the height of the second connecting rod 8 is lower than the height of the inner arm segment 62. In this way, the under-mounted arrangement of the second connecting rod 8 and the knuckle arm 6 can be realized, which is beneficial to the hinge point D being closer to the hinge point C, so as to realize the effect that the first circular arc track A and the second circular arc track B are highly coordinated.

[0091] And / or, another optional embodiment is that the air suspension system is arranged between the vehicle frame 10 and the steering axle with the smallest steering angle range (i.e. the steering angle range of the wheels). When the steering angle range of the steering axle is the smallest, the movable range of the second connecting rod 8 is smaller, so that the hinge point D does not deviate too much from the hinge point C, but can always be adjacent to the hinge point C, thereby also realizing the effect that the first circular arc track A and the second circular arc track B are highly coordinated, and ensuring that the second connecting rod 8 does not interfere with the axle tube of the steering axle during the small steering angle rotation of the wheels when the second connecting rod 8 and the knuckle arm 6 are under-mounted. For example, in a five-axle truck crane, the air suspension system can be arranged between the vehicle frame 10 and the fifth axle with the smallest steering angle range.

[0092] In some embodiments, with reference to Figure 2 and Figure 9, the frame 10 can be provided as a box-type frame, for example, the box-type frame can include a frame cover plate 101, a frame web plate 102 and a frame bottom plate 103, the frame cover plate 101 and the frame bottom plate 103 are arranged in an up-down manner and are connected by the frame web plate 102 arranged in an up-down manner. In addition, the vehicle chassis can include a built-in lateral stabilizing structure 9 arranged in a transverse direction in the box-type frame, and the lateral ends of the built-in lateral stabilizing structure 9 are respectively connected to the middle part of the axle 11 and the lateral inner wall of the box-type frame.

[0093] Based on the above structure, when the axle 11 jumps up or down, the built-in lateral stabilizing structure 9 can prevent the axle 11 from moving laterally, thereby enhancing the stability of the air suspension system, and at the same time, when the whole vehicle turns, the lateral limiting effect of the built-in lateral stabilizing structure 9 can prevent the body from rolling, thereby improving the anti-roll ability of the whole vehicle. The built-in design of the built-in lateral stabilizing structure 9 can make full use of the limited space on the vehicle chassis, especially when the axle 11 is a steering drive axle, the extra space on the vehicle chassis is extremely limited due to the arrangement of the frame 10 and the main axle reduction total, the embodiment sets the built-in lateral stabilizing structure 9 inside the box-type frame, so that the built-in lateral stabilizing structure 9 is feasible and practical, and the space utilization of the vehicle chassis is improved.

[0094] In some embodiments, the built-in lateral stabilizing structure 9 can include a first support 91, a second support 92 and a lateral stabilizing connecting rod 93. Specifically, the first support 91 is fixed (such as welded, bolt assembly fixed, etc.) with the lateral inner wall of the box-type frame, the second support 92 is fixed (such as welded, bolt assembly fixed, etc.) with the middle part of the axle 11, and the two ends of the lateral stabilizing connecting rod 93 are respectively hinged to the first support 91 and the second support 92. At this time, the main function of preventing the axle 11 from moving laterally and limiting the axle 11 in a transverse direction is mainly achieved by the lateral stabilizing connecting rod 93.

[0095] In some embodiments, the outer wall of the box-type frame can be provided with a maintenance hole 104 (such as the maintenance hole 104 can be provided on the frame cover plate 101), which can be used for the operator to maintain the air suspension system and the built-in lateral stabilizing structure 9, so that the later maintenance is more convenient.

[0096] In addition, the third exemplary embodiment of the present application also provides a working vehicle, which comprises the vehicle chassis described above. It should be noted that the present application does not limit the power type of the working vehicle, such as a new energy working vehicle or a fuel-powered working vehicle, which can adopt the vehicle chassis or the air suspension system described above. In addition, the present application also does not limit the working type of the working vehicle. For example, a fuel-powered working vehicle such as a fuel-powered truck crane, a fuel-powered truck crane, a fuel-powered mixer truck, a fuel-powered pump truck, a fuel-powered fire truck, a fuel-powered road construction vehicle, a fuel-powered sanitation vehicle, or a new energy working vehicle such as a new energy truck crane, a new energy truck crane, a new energy mixer truck, a new energy pump truck, a new energy fire truck, a new energy road construction vehicle, or a new energy sanitation vehicle.

[0097] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0098] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0099] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", 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 the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0100] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. An air suspension system, characterized by, The air suspension system comprises: a guide arm assembly (1) for supporting an axle (11) and movably connected to the bottom of a vehicle frame (10); an air spring assembly (2) for connecting the vehicle frame (10) and the guide arm assembly (1), and comprising an air spring body (21) and an internal limiting structure (22) arranged in the air spring body (21); and an external limiting structure (3) arranged on the bottom of the vehicle frame (10) above the axle (11), the external limiting structure (3) being arranged on the bottom of the vehicle frame (10) in a length-adjustable manner so as to enable the maximum up-jump stroke of the axle (11) to be limited by the external limiting structure (3) and / or the internal limiting structure (22). One end of the guide arm assembly (1) is formed as a hinged end for being hinged to the vehicle frame (10), and the other end is formed as a swing end capable of swinging up and down, and the bottom end surface of the external limiting structure (3) is formed as an upwardly inclined inclined limiting surface (35) in a direction from the hinged end to the swing end, the inclined limiting surface (35) being used for limiting the up-jumping axle (11). The external limiting structure (3) comprises: a limiting support (31) arranged on the bottom of the vehicle frame (10) in an up-down direction; a limiting support base (32) sleeved on the limiting support (31) and capable of moving along the axial direction of the limiting support (31); a locking member (33) for locking or unlocking the limiting support base (32) and the limiting support (31); and a buffer member (34) connected to the bottom of the limiting support base (32) and used for limiting the up-jumping axle (11).

2. The air suspension system of claim 1, wherein One end of the guide arm assembly (1) is formed as a hinged end for being hinged to the vehicle frame (10), and the other end is formed as a swing end capable of swinging up and down, the air spring assembly (2) is arranged at the swing end, and the external limiting structure (3) is located between the air spring assembly (2) and the hinged end.

3. Vehicle chassis, characterized in that The air suspension system comprises: a vehicle frame (10); an axle (11) arranged below the vehicle frame (10); and an air suspension system according to claim 1 or 2. The axle (11) comprises a steering axle, and the vehicle chassis further comprises a mechanical steering mechanism, the mechanical steering mechanism comprising:

4. The vehicle chassis of claim 3, wherein, a fixed seat body (4) fixed to the lateral side of the vehicle frame (10) and provided with an axially extending shaft body; a steering rocker arm (5) arranged in an up-down direction and rotatably connected to the shaft body; a steering knuckle arm (6) for fixedly connecting a steering knuckle of the steering axle and a wheel hub, and the steering knuckle arm (6) is arranged in a lateral direction; a first connecting rod (7) arranged in a front-rear direction, one end of the first connecting rod (7) being hinged to the upper end of the steering rocker arm (5), and the other end being used for forming a mechanical transmission connection with a steering wheel; a second connecting rod (8) arranged in a front-rear direction, two ends of the second connecting rod (8) being respectively hinged to the steering knuckle arm (6) and the lower end of the steering rocker arm (5). ​ 5. The vehicle chassis of claim 4, wherein, The guide arm assembly (1) is arranged in the front-rear direction and has a hinged end hinged to the vehicle frame (10), and the second connecting rod (8) is arranged adjacent to the hinged end of the steering rocker arm (5).

6. The vehicle chassis of claim 5, wherein, The steering knuckle arm (6) comprises an outer arm segment (61) and an inner arm segment (62), the outer arm segment (61) is fixedly connected with the steering knuckle and the wheel hub of the steering axle, the height of the inner arm segment (62) is lower than that of the outer arm segment (61), and the inner arm segment (62) is hinged to one end of the second connecting rod (8), and the height of the second connecting rod (8) is lower than that of the inner arm segment (62).

7. The vehicle chassis of claim 5, wherein, The vehicle chassis is provided with a plurality of steering axles, and the air suspension system is arranged between the vehicle frame (10) and the steering axle with the smallest steering angle range.

8. The vehicle chassis of claim 3, wherein, The vehicle frame (10) is a box-type vehicle frame, and the vehicle chassis further comprises an inner built-in lateral stabilizing structure (9) arranged in the lateral direction in the box-type vehicle frame, and the lateral ends of the inner built-in lateral stabilizing structure (9) are respectively connected to the middle part of the axle (11) and the lateral inner wall of the box-type vehicle frame.

9. The vehicle chassis of claim 8, wherein, The inner built-in lateral stabilizing structure (9) comprises: a first support (91) fixed to the lateral inner wall of the box-type vehicle frame; a second support (92) fixed to the middle part of the axle (11); a lateral stabilizing connecting rod (93) hinged to the first support (91) and the second support (92) at two ends thereof.

10. The vehicle chassis of claim 8, wherein, The outer wall of the box-type vehicle frame is provided with a maintenance hole (104) for maintaining the air suspension system and the inner built-in lateral stabilizing structure (9).

11. A new energy work vehicle, characterized in that, The vehicle chassis according to any one of claims 3 to 10. The vehicle chassis according to any one of claims 3 to 10.

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