Dump truck rear axle suspension structure and dump truck
By designing a rear axle suspension structure of the dump truck including a rear axle, a suspension cylinder and a transverse tie rod assembly, the problem of excessive lateral load between the frame and the rear axle shell in the prior art is solved, and the effect of reducing lateral displacement and additional load is achieved, which improves the safety and stability of the entire truck operation of the dump truck.
Patent Information
- Application Number
- CN202510103154.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2025-04-04
AI Technical Summary
When the cargo box moves with the suspension cylinder, the existing dump truck rear axle suspension structure will cause a transverse additional load between the frame and the rear axle shell, affecting the life of the component.
A dump truck rear axle suspension structure is designed, including a rear axle, a suspension cylinder and a tie rod assembly. The cross-tie rod assembly consists of a connecting rod and two cross-tie rods. The middle part of the connecting rod is movable to the frame and the rear axle shell, and the end part of the cross-tie rod is movable to the connecting rod and the frame or the rear axle shell. Through this design, the motion decoupling of the cross-tie rod assembly is achieved.
By reducing the lateral displacement of the cargo box with the movement of the suspension cylinder, the lateral additional load between the frame and the rear axle is reduced, and the safety and stability of the entire truck of the dump truck are improved.
Smart Images
Figure CN119749132A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a rear axle suspension structure of a dump truck and the dump truck. Background Art
[0002] During the design process of dump trucks, the rear suspension structure usually adopts a large triangle form, and the lateral displacement is constrained by the tie rod. However, when the cargo box moves up and down with the suspension cylinder, the frame and cargo box will produce 6mm to 10mm lateral movement with the rear axle housing. For example, dump trucks such as mining dump trucks have the characteristics of large loads. When the dump truck is fully loaded, a lateral additional load will be generated between the frame and the rear axle housing, which will have an adverse effect on the life of components such as the cargo box, frame and rear axle housing. Summary of the invention
[0003] A main purpose of the present disclosure is to overcome at least one of the above-mentioned defects of the prior art and to provide a dump truck rear axle suspension structure capable of reducing the lateral additional load between the frame and the rear axle.
[0004] To achieve the above objectives, the present disclosure adopts the following technical solutions:
[0005] According to one aspect of the present disclosure, there is provided a rear axle suspension structure of a dump truck, which includes a rear axle, a suspension cylinder and a tie rod assembly; the rear axle includes a rear axle housing arranged below the frame of the dump truck; one end of the suspension cylinder is connected to the rear axle housing, and the other end is used to connect to the frame; the tie rod assembly includes a connecting rod and two cross bars; the middle part of the connecting rod is movably connected to one of the frame and the rear axle housing; one end of each of the two cross bars is movably connected to the other of the frame and the rear axle housing, and the other end of each of the two cross bars is movably connected to both ends of the connecting rod; one of the cross bars is arranged at a height higher than the other of the cross bars, so that the connecting rod has an angle greater than 0 and less than 90° with the horizontal plane.
[0006] According to one embodiment of the present disclosure, the connecting rod extends perpendicular to the longitudinal direction of the dump truck, the middle portion of the connecting rod is connected to one of the frame and the rear axle housing via a first rotating pair, and the rotation axis of the first rotating pair is parallel to the longitudinal direction.
[0007] According to one embodiment of the present disclosure, the first rotating pair includes a first pin and a sleeve; the first pin passes through the middle of the connecting rod and extends parallel to the longitudinal direction, and one end of the first pin is connected to one of the frame and the rear axle housing; the sleeve is sleeved between the first pin and the connecting rod.
[0008] According to one embodiment of the present disclosure, one end of the cross bar is connected to the other of the frame and the rear axle housing via a first ball joint, and the other end of the cross bar is connected to the connecting rod via a second ball joint.
[0009] According to one embodiment of the present disclosure, the first ball joint pair includes a first joint bearing and a second pin shaft; the first joint bearing includes an outer ring and an inner ring with spherical fit, and the first joint bearing is arranged at one end of the cross bar via the outer ring; the second pin shaft passes through the inner ring of the first joint bearing, and one end of the second pin shaft is connected to the other of the frame and the rear axle housing.
[0010] According to one embodiment of the present disclosure, the second ball joint pair includes a second joint bearing and a third pin; the second joint bearing includes a spherically matched outer ring and an inner ring, and the second joint bearing is arranged at the other end of the cross bar via the outer ring; the third pin is passed through the inner ring of the second joint bearing, and at least one end of the third pin is connected to the connecting rod.
[0011] According to one embodiment of the present disclosure, through grooves are respectively provided at both ends of the connecting rod, the other end of the cross bar is located in the through groove, the third pin shaft is passed through the position where the through groove is provided on the connecting rod, the two ends of the third pin shaft are respectively connected to the connecting rod, and the middle part of the third pin shaft is passed through the inner ring of the second joint bearing.
[0012] According to one embodiment of the present disclosure, the middle portion of the connecting rod is connected to one of the vehicle frame and the rear axle housing via a third ball joint.
[0013] According to one embodiment of the present disclosure, one end of the cross bar is connected to the other of the frame and the rear axle housing via a second rotation pair, and the other end of the cross bar is connected to the connecting rod via a third rotation pair.
[0014] It can be seen from the above technical solutions that the advantages and positive effects of the dump truck rear axle suspension structure proposed in the present disclosure are:
[0015] The rear axle suspension structure of the dump truck proposed in the present disclosure includes a rear axle, a suspension cylinder and a tie rod assembly; the rear axle includes a rear axle housing arranged below the frame of the dump truck; one end of the suspension cylinder is connected to the rear axle housing, and the other end is used to connect the frame; the tie rod assembly includes a connecting rod and two cross bars; the middle part of the connecting rod is movably connected to one of the frame and the rear axle housing; one end of each of the two cross bars is movably connected to the other of the frame and the rear axle housing, and the other ends of each of the two cross bars are movably connected to the two ends of the connecting rod; the arrangement height of one of the cross bars is higher than the other cross bar, so that the connecting rod has an angle greater than 0 and less than 90° with the horizontal plane. Through the above design, the present disclosure utilizes the motion decoupling of the tie rod assembly, which can greatly reduce the lateral displacement of the dump truck's cargo box caused by the movement of the suspension cylinder, reduce the lateral additional load between the frame and the rear axle, and is conducive to improving the safety and stability of the whole vehicle operation of the dump truck.
[0016] Another main purpose of the present disclosure is to overcome at least one defect of the above-mentioned prior art and provide a dump truck with better vehicle operation safety and stability.
[0017] To achieve the above objectives, the present disclosure adopts the following technical solutions:
[0018] According to another aspect of the present disclosure, a dump truck is provided, which includes the dump truck rear axle suspension structure proposed in the present disclosure and described in the above embodiments.
[0019] It can be seen from the above technical solution that the advantages and positive effects of the dump truck proposed in the present disclosure are:
[0020] The dump truck proposed in the present disclosure can reduce the lateral additional load between the frame and the rear axle by adopting the dump truck rear axle suspension structure proposed in the present disclosure, thereby improving the safety and stability of the entire vehicle operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Various objects, features and advantages of the present disclosure will become more apparent by considering the following detailed description of preferred embodiments of the present disclosure in conjunction with the accompanying drawings. The accompanying drawings are merely exemplary illustrations of the present disclosure and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always refer to the same or similar parts. Among them:
[0022] Figure 1 is a schematic diagram showing an application of a rear axle suspension structure of a dump truck when it is installed on a vehicle frame according to an exemplary embodiment;
[0023] Figure 2 yes Figure 1 A schematic structural diagram of a tie rod assembly is shown;
[0024] Figure 3 is along Figure 2 Schematic diagram of the cross section made by the broken line AA in the figure.
[0025] The following are the descriptions of the reference numerals:
[0026] 100. Frame;
[0027] 200. Rear axle housing;
[0028] 300. Suspension cylinder;
[0029] 400. Tie rod assembly;
[0030] 410. Connecting rod;
[0031] 411. First pin;
[0032] 412. Bushing;
[0033] 413. Through slot;
[0034] 420. horizontal bar;
[0035] 421. First joint bearing;
[0036] 422. Second pin;
[0037] 423. Second joint bearing;
[0038] 424. The third pin;
[0039] α. Angle;
[0040] L0. Geometric center line;
[0041] S0. Horizontal reference plane. DETAILED DESCRIPTION
[0042] Typical embodiments that embody the features and advantages of the present disclosure will be described in detail in the following description. It should be understood that the present disclosure can have various changes in different embodiments without departing from the scope of the present disclosure, and the descriptions and drawings therein are essentially for illustrative purposes rather than for limiting the present disclosure.
[0043] In the following description of different exemplary embodiments of the present disclosure, reference is made to the accompanying drawings, which form a part of the present disclosure and in which different exemplary structures, systems and steps that can implement multiple aspects of the present disclosure are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the present disclosure. Moreover, although the terms "above", "between", "within", etc. may be used in this specification to describe different exemplary features and elements of the present disclosure, these terms are used herein only for convenience, such as according to the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present disclosure.
[0044] See also Figure 1 , which representatively shows a schematic diagram of the application of the dump truck rear axle suspension structure proposed in the present disclosure when it is installed on the frame 100. In this exemplary embodiment, the dump truck rear axle suspension structure proposed in the present disclosure is described by taking the application of the dump truck for mining as an example. It is easy for those skilled in the art to understand that in order to apply the relevant design of the present disclosure to other types of dump trucks, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the dump truck rear axle suspension structure proposed in the present disclosure.
[0045] like Figure 1 As shown, in one embodiment of the present disclosure, the rear axle suspension structure of the dump truck proposed in the present disclosure includes a rear axle, a suspension cylinder 300 and a tie rod assembly 400. Figure 2 and Figure 3 , Figure 2 A schematic structural diagram of a tie rod assembly 400 is representatively shown in FIG. Figure 3 The representative diagram shows the Figure 2 The following is a cross-sectional diagram of the broken line AA in FIG. In conjunction with the above drawings, the structures, connection modes and functional relationships of the main components of the rear axle suspension structure of the dump truck proposed in the present disclosure are described in detail.
[0046] like Figures 1 to 3As shown, in one embodiment of the present disclosure, the rear axle includes a rear axle housing 200 disposed below the frame 100 of the dump truck. One end of the suspension cylinder 300 is connected to the rear axle housing 200, and the other end is used to connect to the frame 100. Wherein, the two ends of the suspension cylinder 300 can be rotatably connected to the rear axle housing 200 and the frame 100, for example, the cylinder barrel of the suspension cylinder 300 is rotatably connected to the frame 100, and the cylinder rod of the suspension cylinder 300 is rotatably connected to the rear axle housing 200. The tie rod assembly 400 includes a connecting rod 410 and two cross bars 420. The middle part of the connecting rod 410 is movably connected to the frame 100. One end of each of the two cross bars 420 is movably connected to the rear axle housing 200, and the other end of each of the two cross bars 420 is movably connected to the two ends of the connecting rod 410. The arrangement height of one of the cross bars 420 is higher than that of the other cross bar 420, so that the connecting rod 410 has an angle α greater than 0 and less than 90° with the horizontal plane. The angle α can refer to Figure 2 The angle between the geometric center line L0 of the connecting rod 410 and a horizontal reference plane S0 is shown. Through the above design, the present disclosure utilizes the motion decoupling of the tie rod assembly 400 to significantly reduce the lateral displacement of the dump truck's cargo box caused by the movement of the suspension cylinder 300, reduce the lateral additional load between the frame 100 and the rear axle, and help improve the safety and stability of the dump truck's entire vehicle operation.
[0047] Specifically, through tests on a certain type of mining dump truck, it was verified that after optimizing the arrangement of the dump truck rear axle suspension structure proposed in the present invention, the left and right lateral displacement of the frame 100 and the rear axle housing 200 during the up and down vertical movement can be ensured to be less than 0.5 mm, which is much smaller than the lateral displacement of 6 mm to 10 mm when the existing design is used.
[0048] It should be noted that the above embodiment is described by taking the example that the connecting rod 410 is connected to the frame 100 and the cross bar 420 is connected to the rear axle housing 200. In some other embodiments of the present disclosure, the connecting rod 410 may also be connected to the rear axle housing 200, and the cross bar 420 may also be connected to the frame 100. In other words, in various possible embodiments consistent with the design concept of the present disclosure, the middle part of the connecting rod 410 is movably connected to one of the frame 100 and the rear axle housing 200. One end of each of the two cross bars 420 is movably connected to the other of the frame 100 and the rear axle housing 200.
[0049] like Figure 2 As shown, refer to Figure 2 The plane structure shown defines a reference plane perpendicular to the longitudinal direction of the dump truck (for example, the D1 direction shown in the figure). On this reference plane, the orthographic projection figures of the two cross bars 420 can be arranged in a point-symmetrical manner, and the symmetry point is the orthographic projection of the connection position between the connecting rod 410 and the frame 100 (for example, the axis center of the first pin 411) on the reference plane.
[0050] like Figure 1 As shown, in one embodiment of the present disclosure, the connecting rod 410 extends perpendicular to the longitudinal direction of the dump truck, and the middle part of the connecting rod 410 can be connected to the frame 100 (or the rear axle housing 200) via a first rotating pair, and the rotation axis of the first rotating pair (such as the axis of the first pin 411 described below) is parallel to the longitudinal direction. Through the above design, the present disclosure can use the first rotating pair to realize the axial rotation connection between the connecting rod 410 and the frame 100.
[0051] like Figure 2 and Figure 3 As shown, based on the design that the connecting rod 410 is connected to the frame 100 via the first rotation pair, in one embodiment of the present disclosure, the first rotation pair may include a first pin 411 and a sleeve 412. The first pin 411 is inserted into the middle of the connecting rod 410, the first pin 411 extends parallel to the longitudinal direction, and one end of the first pin 411 is connected to the frame 100 (or the rear axle housing 200). The sleeve 412 is sleeved between the first pin 411 and the connecting rod 410. In some embodiments, the present disclosure may also adopt other structural types of shaft rotation structures as the first rotation pair, such as a combination structure of a rotating shaft and a bearing, which is not limited to this embodiment.
[0052] In one embodiment of the present disclosure, one end of the cross bar 420 can be connected to the rear axle housing 200 (or the vehicle frame 100) via a first ball joint, and the other end of the cross bar 420 can be connected to the end of the connecting rod 410 via a second ball joint. Through the above design, the present disclosure can use the first ball joint and the second ball joint to achieve the ball rotation connection between the cross bar 420 and the connecting rod 410 and the rear axle housing 200. Accordingly, at the connection positions at both ends of the cross bar 420, spherical rotation trajectories relative to the connecting rod 410 and the rear axle housing 200 can be generated, further optimizing the effect of motion decoupling of the tie rod assembly 400.
[0053] like Figure 2 and Figure 3 As shown, based on the design that the cross bar 420 is connected to the rear axle housing 200 via the first ball joint pair, in one embodiment of the present disclosure, the first ball joint pair may include a first joint bearing 421 and a second pin 422. The first joint bearing 421 includes an outer ring and an inner ring with spherical fit, and the first joint bearing 421 is arranged at one end of the cross bar 420 via the outer ring. The second pin 422 is inserted into the inner ring of the first joint bearing 421, and one end of the second pin 422 is connected to the rear axle housing 200 (or the frame 100). In some embodiments, the present disclosure may also adopt other structural types of ball rotation structures as the first ball joint pair, such as a combination structure of a ball head and a joint bearing, which is not limited to this embodiment.
[0054] like Figure 2 and Figure 3 As shown, based on the design that the cross bar 420 is connected to the connecting rod 410 via the second ball joint pair, in one embodiment of the present disclosure, the second ball joint pair may include a second joint bearing 423 and a third pin 424. The second joint bearing 423 includes an outer ring and an inner ring with spherical fit, and the second joint bearing 423 is arranged at one end of the cross bar 420 via the outer ring. The third pin 424 is penetrated through the inner ring of the second joint bearing 423, and one end of the third pin 424 is connected to the rear axle housing 200 (or the frame 100). In some embodiments, the present disclosure may also adopt other structural types of ball rotation structures as the second ball joint pair, such as a combination structure of a ball head and a joint bearing, which is not limited to this embodiment.
[0055] like Figure 3 As shown, based on the design that the second ball joint pair includes the second joint bearing 423 and the third pin 424, in one embodiment of the present disclosure, both ends of the connecting rod 410 can be respectively provided with a through slot 413, the other end of the cross bar 420 is located in the through slot 413, the third pin 424 is penetrated at the position where the through slot 413 is provided on the connecting rod 410, both ends of the third pin 424 are respectively connected to the connecting rod 410, and the middle part of the third pin 424 is penetrated in the inner ring of the second joint bearing 423. Through the above design, the present disclosure can strengthen the connection strength between the third pin 424 and the connecting rod 410, thereby strengthening the connection strength between the connecting rod 410 and the cross bar 420 via the second ball joint pair.
[0056] Different from Figures 1 to 3 In the illustrated embodiment, the connecting rod 410 is connected to the vehicle frame 100 via a first rotational pair. In another embodiment not shown in the present disclosure, the middle portion of the connecting rod 410 can also be connected to the vehicle frame 100 (or the rear axle housing 200) via a third ball joint pair. Through the above design, the present disclosure can use the third ball joint pair to achieve a ball rotation connection between the connecting rod 410 and the vehicle frame 100. Accordingly, a spherical rotation trajectory can be generated at the connection position between the connecting rod 410 and the vehicle frame 100, further optimizing the effect of the motion decoupling of the tie rod assembly 400.
[0057] Different from Figures 1 to 3 In the illustrated embodiment, the cross bar 420 is connected to the rear axle housing 200 via a first ball joint. In another embodiment not shown in the present disclosure, one end of the cross bar 420 may also be connected to the rear axle housing 200 (or the frame 100) via a second rotational joint. The extending direction of the cross bar 420 may be perpendicular to the longitudinal direction of the dump truck, and the rotation axis of the second rotational joint is parallel to the longitudinal direction.
[0058] Different from Figures 1 to 3In the illustrated embodiment, the cross bar 420 is connected to the connecting rod 410 via a second ball joint. In another embodiment not shown in the present disclosure, the other end of the cross bar 420 may also be connected to the connecting rod 410 via a third rotational pair. The extending direction of the cross bar 420 may be perpendicular to the longitudinal direction of the dump truck, and the rotation axis of the third rotational pair is parallel to the longitudinal direction.
[0059] It should be noted here that the dump truck rear axle suspension structures shown in the drawings and described in this specification are only a few examples of the many dump truck rear axle suspension structures that can adopt the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are by no means limited to any details or any components of the dump truck rear axle suspension structures shown in the drawings or described in this specification.
[0060] In summary, the rear axle suspension structure of the dump truck proposed in the present invention includes a rear axle, a suspension cylinder 300 and a tie rod assembly 400; the rear axle includes a rear axle housing 200 arranged below the frame 100 of the dump truck; one end of the suspension cylinder 300 is connected to the rear axle housing 200, and the other end is used to connect to the frame 100; the tie rod assembly 400 includes a connecting rod 410 and two cross bars 420; the middle part of the connecting rod 410 is movably connected to one of the frame 100 and the rear axle housing 200; each end of the two cross bars 420 is movably connected to the other of the frame 100 and the rear axle housing 200, and the other ends of the two cross bars 420 are movably connected to both ends of the connecting rod 410; the arrangement height of one of the cross bars 420 is higher than that of the other cross bars 420, so that the connecting rod 410 has an angle greater than 0 and less than 90° with the horizontal plane. Through the above design, the present invention utilizes the motion decoupling of the tie rod assembly 400, which can significantly reduce the lateral displacement of the dump truck's cargo box caused by the movement of the suspension cylinder 300, reduce the lateral additional load between the frame 100 and the rear axle, and is beneficial to improving the safety and stability of the dump truck's overall vehicle operation.
[0061] Based on the above detailed description of several exemplary embodiments of the rear axle suspension structure of the dump truck proposed in the present disclosure, an exemplary embodiment of the dump truck proposed in the present disclosure is described.
[0062] like Figure 1 As shown, in one embodiment of the present disclosure, the dump truck proposed in the present disclosure includes the dump truck rear axle suspension structure proposed in the present disclosure and described in detail in the above embodiments.
[0063] It should be noted here that the dump trucks shown in the drawings and described in this specification are only a few examples of many types of dump trucks that can adopt the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are by no means limited to any details or any components of the dump trucks shown in the drawings or described in this specification.
[0064] In summary, the dump truck proposed in the present disclosure, by adopting the dump truck rear axle suspension structure proposed in the present disclosure, can reduce the lateral additional load between the frame and the rear axle, thereby improving the safety and stability of the entire vehicle operation.
[0065] The above detailed description and / or illustration of the exemplary embodiments of the dump truck rear axle suspension structure and dump truck proposed by the present disclosure. However, the embodiments of the present disclosure are not limited to the specific embodiments described herein. On the contrary, the components and / or steps of each embodiment can be used independently and separately from other components and / or steps described herein. Each component and / or each step of an embodiment can also be used in combination with other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated herein, the terms "one", "one" and "above" are used to indicate the presence of one or more elements / components / etc. The terms "comprising", "including" and "having" are used to indicate the meaning of open inclusion and mean that in addition to the listed elements / components / etc., there may be other elements / components / etc. In addition, the terms "first" and "second" in the claims and the specification are used only as marks and are not numerical restrictions on their objects.
[0066] Although the dump truck rear axle suspension structure and the dump truck proposed by the present disclosure have been described according to different specific embodiments, those skilled in the art will recognize that the present disclosure can be implemented with modifications within the spirit and scope of the claims.
Claims
1. A dump truck rear axle suspension structure, characterized in that: include: A rear axle, comprising a rear axle housing disposed below a frame of the dump truck; A suspension cylinder, one end of which is connected to the rear axle housing and the other end of which is used to connect to the vehicle frame; The tie rod assembly comprises: A connecting rod, a portion of which is movably connected to one of the vehicle frame and the rear axle housing; Two cross bars, each one end of the two cross bars is movably connected to the other of the frame and the rear axle housing, and each other end of the two cross bars is movably connected to the two ends of the connecting rod; one of the cross bars is arranged at a height higher than the other cross bar, so that the connecting rod has an angle greater than 0 and less than 90° with the horizontal plane.
2. The rear axle suspension structure of a dump truck according to claim 1, characterized in that: The connecting rod extends perpendicularly to the longitudinal direction of the dump truck, a middle portion of the connecting rod is connected to one of the frame and the rear axle housing via a first rotating pair, and a rotation axis of the first rotating pair is parallel to the longitudinal direction.
3. The rear axle suspension structure of a dump truck according to claim 2, characterized in that: The first rotation pair comprises: A first pin shaft, which passes through the middle of the connecting rod and extends parallel to the longitudinal direction, and one end of the first pin shaft is connected to one of the frame and the rear axle housing; A shaft sleeve is sleeved between the first pin and the connecting rod.
4. The rear axle suspension structure of a dump truck according to claim 1, characterized in that: One end of the cross bar is connected to the other of the vehicle frame and the rear axle housing via a first ball joint, and the other end of the cross bar is connected to the connecting rod via a second ball joint.
5. The rear axle suspension structure of a dump truck according to claim 4, characterized in that: The first ball joint pair comprises: A first spherical bearing, comprising an outer ring and an inner ring with spherical fit, wherein the first spherical bearing is arranged at one end of the crossbar via the outer ring; A second pin shaft is passed through the inner ring of the first spherical bearing, and one end of the second pin shaft is connected to the other of the vehicle frame and the rear axle housing.
6. The rear axle suspension structure of a dump truck according to claim 4, characterized in that: The second ball joint pair comprises: A second spherical bearing, comprising an outer ring and an inner ring with spherical fit, wherein the second spherical bearing is arranged at the other end of the crossbar via the outer ring; A third pin shaft is passed through the inner ring of the second spherical bearing, and at least one end of the third pin shaft is connected to the connecting rod.
7. The rear axle suspension structure of a dump truck according to claim 6, characterized in that: The two ends of the connecting rod are respectively provided with through grooves, the other end of the cross bar is located in the through groove, the third pin shaft is penetrated through the position where the through groove is provided on the connecting rod, the two ends of the third pin shaft are respectively connected to the connecting rod, and the middle part of the third pin shaft is penetrated through the inner ring of the second joint bearing.
8. The rear axle suspension structure of a dump truck according to claim 1, characterized in that: The middle portion of the connecting rod is connected to one of the vehicle frame and the rear axle housing via a third ball joint.
9. The rear axle suspension structure of a dump truck according to claim 1, characterized in that: One end of the cross bar is connected to the other of the frame and the rear axle housing via a second rotation pair, and the other end of the cross bar is connected to the connecting rod via a third rotation pair.
10. A dump truck, characterized in that: It comprises the rear axle suspension structure of a dump truck as described in any one of claims 1 to 9.