Front suspension system, chassis and mining heavy-load dump truck

Abstract

The invention discloses a front suspension system, a chassis and a mining heavy-load dump truck. The front suspension system comprises a front plate spring assembly, a telescopic shock absorber, a transverse pull rod and a longitudinal thrust rod. The two front plate spring assemblies are arranged on the two sides of the vehicle in the transverse direction, the middle areas of the front plate spring assemblies are fixed to a front axle, and the two longitudinal ends of the front plate spring assemblies and a vehicle frame are fixed together. The two telescopic shock absorbers are arranged in the middle areas of the outer side faces of the two front plate spring assemblies in the transverse direction, the tops of the telescopic shock absorbers are connected with a frame, and the bottoms of the telescopic shock absorbers are connected with a front axle. The tie rod is arranged between the two front plate spring assemblies, one end of the tie rod is connected with the frame, and the other end of the tie rod is connected with the front axle. The two longitudinal thrust rods are arranged on the two sides of the vehicle in the transverse direction, one end of each longitudinal thrust rod is connected with the vehicle frame, and the other end is connected with the front axle. The device is simple in structure and high in reliability, multi-direction restraining and elastic damping functions are achieved, vibration of a whole vehicle in multi-direction restraining and limiting and vibration of a frame and a vehicle body can be limited, and the comfort and the reliability of the whole vehicle are improved.

Description

Technical Field

[0001] The invention relates to a front suspension system with a multi-directional restraining device and an elastic shock absorbing device, belonging to the technical field of engineering vehicles. Background Art

[0002] A mining dump truck is a vehicle used for mining transportation. Its dimensions are not limited. In order to increase the transportation volume of each vehicle, the volume of the carriage is increased as much as possible within its use environment, and the dimensions of the vehicle are widened and heightened. The load capacity of this type of vehicle is between 4 and 360 tons, and it is also developing in the direction of large-scale. Mining vehicles will be affected by road impact when driving on the road. Due to the harsh working environment of mining vehicles, they mostly work in mining areas with poor road conditions and complex and changeable use conditions. Therefore, the dynamic loads on mining vehicles vary greatly. When heavy loads are driven on bumpy roads with many slopes, many bends or many side slopes, the impact loads and random loads from the road are a very big challenge to the structure of the vehicle. At the same time, the suspension system is the first to be impacted, reducing its service life.

[0003] The suspension of a mining dump truck is a mechanism that connects the wheels to the vehicle body, supporting and reducing vibrations on the vehicle body. It mainly transmits the force acting between the wheels and the frame, and buffers the impact force transmitted to the frame or body from uneven roads, attenuating the vibration caused thereby, to ensure that the vehicle can run smoothly.

[0004] According to the classification of different elastic elements, the commonly used suspension forms for mining dump trucks are leaf spring suspension and oil-gas cylinder suspension. Leaf spring suspension is widely used because of its simple structure, easy maintenance and low cost. In the existing structure, the leaf spring is an elastic element and also plays the role of balancing the lateral force and the longitudinal force. The leaf spring is also not effectively limited, and it is easy to collide with other parts when the impact is large. With the increase of load, due to the unreasonable design of the existing connection structure, when dealing with the harsh working conditions of mining dump trucks, there is a problem of frequent failure of leaf springs and suspension connectors.

[0005] The existing leaf spring suspension technology can refer to Chinese patents CN105377594A and CN116691252A; in order to solve the problem of leaf spring limit and hard collision, the technical solutions that can be referred to are Chinese patents CN206217532U, CN207670132U, CN209395530U, and CN212499771U. The above technical solutions are relatively complex in structure, poor in reliability, and cannot achieve the expected implementation effect. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a front suspension system, which is composed of a tie rod, multiple longitudinal thrust rods, multiple leaf springs, multiple cylinder shock absorbers, multiple limit blocks, etc.; it has a simple structure and strong reliability, meets the multi-directional constraint and elastic shock absorption functions, and can limit the vibration of the vehicle in multi-directional constraint and limit and the frame body, and improve the comfort and reliability of the vehicle. The front suspension components are arranged reasonably, and all components can be repaired without disassembling components such as tires and axles, and it is easy to disassemble and replace components with less labor time.

[0007] The present invention is implemented according to the following technical solutions: In a first aspect, the present invention provides a front suspension system, wherein the vehicle travel direction is set to be a longitudinal direction, comprising: Two front leaf spring assemblies used as elastic elements are arranged on both sides of the vehicle in the transverse direction, the middle area of ​​the front leaf spring assembly is fixed to the front axle, and the two longitudinal ends of the front leaf spring assembly are fixed to the frame; Two cylinder shock absorbers are arranged at the middle area of ​​the outer side surfaces in the transverse direction of the two front leaf spring assemblies, and the tops thereof are connected to the vehicle frame and the bottoms are connected to the front axle; A tie rod is arranged between the two front leaf spring assemblies, one end of which is connected to the vehicle frame and the other end is connected to the front axle, and is used to bear the lateral force and displacement between the front axle and the vehicle frame; Two longitudinal thrust rods are arranged on both sides of the vehicle in the transverse direction, one end of which is connected to the frame and the other end is connected to the front axle, and are used to bear the longitudinal force and displacement between the front axle and the frame.

[0008] In some embodiments, it also includes: A limit block is installed on the vehicle frame above the front leaf spring assembly and is used to limit the vertical upward displacement of the front leaf spring assembly.

[0009] In some embodiments, two limit blocks are provided directly above the front leaf spring assembly and are arranged along its longitudinal direction, and the two limit blocks are symmetrically arranged about the transverse center line of the front leaf spring assembly.

[0010] In some embodiments, a leaf spring pressure plate is provided in the middle area of ​​the top surface of the front leaf spring assembly, and the leaf spring pressure plate and the front leaf spring assembly are fixed to the front axle by at least one N-type bolt.

[0011] In some embodiments, the leaf spring pressure plate is divided into three parts: The middle part has at least one shock-absorbing hole on the top surface and a center positioning hole on the bottom surface for avoiding the center positioning stud installed on the front leaf spring assembly; The front area has a stop block directly above it, and the vertical downward projection area of ​​the stop block is slightly smaller than the top area of ​​the front area; the bottom surface of the front area is a thick inner and thin outer inclined surface, which is used to avoid the fixing ring installed on the front leaf spring assembly; The rear area has a limit block directly above it, and the vertical downward projection area of ​​the limit block is slightly smaller than the top area of ​​the rear area; the bottom surface of the rear area is a slope that is thick inside and thin outside, which is used to avoid the fixing ring installed on the front leaf spring assembly.

[0012] In some embodiments, the top surface dividing portion of the front area and the middle portion and the top surface dividing portion of the rear area and the middle portion are each provided with a groove penetrating the leaf spring pressure plate along the longitudinal direction; the two N-type bolts are respectively embedded in the corresponding grooves.

[0013] In some embodiments, a symmetrically arranged upper support of a cartridge shock absorber is installed on each of the outer sides in the transverse direction of the frame, and the top of the cartridge shock absorber is connected to the upper support of the cartridge shock absorber; the limit block is fixed on the bottom surface of the upper support of the cartridge shock absorber.

[0014] In some embodiments, the other end of the tie rod is connected to a tie rod support located on the front axle; the tie rod support is an integral casting, on which is provided a tie rod support positioning hole for cooperating with a positioning pin on the front axle to fix the tie rod support to the front axle via bolts.

[0015] In some embodiments, the tie rod, two longitudinal thrust rods and two tube shock absorbers are all arranged at the front end in the longitudinal direction of the front axle; the two longitudinal thrust rods, two tube shock absorbers and two front leaf spring assemblies are all arranged symmetrically about the longitudinal center line of the frame.

[0016] In a second aspect, the present invention provides a chassis comprising the above-mentioned front suspension system.

[0017] In a third aspect, the present invention provides a heavy-duty dump truck for mining, comprising the above-mentioned front suspension system; or, comprising the above-mentioned chassis.

[0018] Beneficial effects of the present invention: 1. The front suspension system consists of a tie rod, multiple longitudinal thrust rods, multiple leaf springs, multiple cylinder shock absorbers, multiple limit blocks, etc. It has a simple structure, strong reliability, and meets multi-directional constraints and elastic shock absorption functions.

[0019] 2. When crossing obstacles and emergency braking, it can limit the multi-directional constraints and vibrations of the vehicle frame and body, thereby improving the comfort and reliability of the vehicle.

[0020] 3. The front suspension components are arranged reasonably, and all components can be repaired without removing tires, axles and other components. It is easy to disassemble and replace components with less labor hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0022] In the attached picture: Figure 1 It is a schematic diagram of the assembly and application of the front suspension system of the present invention; Figure 2 A schematic diagram of a leaf spring pressure plate of the present invention from a first viewing angle; Figure 3 A second perspective schematic diagram of the leaf spring pressure plate of the present invention; Figure 4 It is a schematic diagram of the structure of the front suspension system of the present invention; Figure 5 A schematic diagram of a tie rod support according to the present invention from a first viewing angle; Figure 6 This is a schematic diagram of the tie rod support from a second viewing angle of the present invention.

[0023] Figure identification: 1-frame; 2-front axle; 3-tie rod; 4-longitudinal thrust rod; 5-front leaf spring assembly; 6-cylinder shock absorber; 7-leaf spring pressure plate; 8-limiting block; 9-n-type bolt; 201-locating pin; 301-tie rod support; 30101-tie rod support locating hole; 302-bolt; 501-center locating stud; 701-center locating hole; 702-leaf spring pressure plate contact surface; 703-groove.

[0024] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0026] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figure 1 As shown, a front suspension system sets the vehicle's travel direction as the longitudinal direction and Figure 1 The direction of the arrow shown is the front direction of the vehicle, which includes two front leaf spring assemblies 5 used as elastic elements, two cylinder shock absorbers 6, a tie rod 3 and two longitudinal thrust rods 4; the two front leaf spring assemblies 5 are arranged on both sides of the vehicle in the transverse direction, the middle area of ​​the front leaf spring assembly 5 is fixed on the front axle 2, and the two longitudinal ends of the front leaf spring assembly 5 are fixed together with the frame 1; the two cylinder shock absorbers 6 are arranged in the middle area of ​​the outer side surfaces of the two front leaf spring assemblies 5 in the transverse direction, and the tops thereof are connected to the frame 1, and the bottoms are connected to the front axle 2; the tie rod 3 is arranged between the two front leaf spring assemblies 5, one end of which is connected to the frame 1, and the other end is connected to the front axle 2, for bearing the lateral force and displacement between the front axle 2 and the frame 1; the two longitudinal thrust rods 4 are arranged on both sides of the vehicle in the transverse direction, one end of which is connected to the frame 1, and the other end is connected to the front axle 2, for bearing the longitudinal force and displacement between the front axle 2 and the frame 1.

[0029] It should be noted that the tie rod 3 is the main constraint between the front axle 2 and the frame 1 in the left-right direction; the longitudinal thrust rod 4 is the main constraint between the front axle 2 and the frame 1 in the front-back direction; the front leaf spring assembly 5 is mainly used for partial up-and-down constraints of the front suspension system and the dominant up-and-down elastic damping; the lower bracket of the cylinder shock absorber 6 is bolted to the upper end of the front axle 2, and its upper bracket is bolted to the frame 1. Its installation position is determined by the weight and size (cab) of the main front components (engine, gearbox and cab). Its main function is partial up-and-down constraints of the front suspension system and auxiliary up-and-down elastic damping. The front leaf spring assembly 5 and the cylinder shock absorber 6 work together to form the up-and-down constraints and shock-absorbing and buffering elements of the front suspension.

[0030] For further solutions, please refer to Figure 1 As shown, a limit block 8 is also included, which is installed on the frame 1 above the front leaf spring assembly 5 and is used to limit the vertical upward displacement of the front leaf spring assembly 5.

[0031] The preferred solution is to continue to refer to Figure 1 As shown, two limit blocks 8 arranged along the longitudinal direction of the front leaf spring assembly 5 are provided directly above the front leaf spring assembly 5 , and the two limit blocks 8 are symmetrically arranged about the transverse center line of the front leaf spring assembly 5 .

[0032] It should be noted that the limit block 8 is a component made of steel plate and rubber vulcanized in one piece, and is fixedly assembled on the lower side of the upper support of the cylinder shock absorber with four bolts. Its function is to act as a limit buffer for the front frame 2 and the front leaf spring assembly 5 on bumpy roads, reducing the extrusion and fracture between the leaf spring and the frame under extreme working conditions. The distance between the limit block 8 and the front leaf spring assembly 5 is determined by the weight of the whole vehicle, the stiffness of the front leaf spring assembly 5 and the stiffness of the cylinder shock absorber 6. The reason why the limit block 8 is fixed with bolts is to facilitate its replacement when the rubber fails due to aging.

[0033] It is further explained here that there are four limit blocks 8, which are distributed on the left and right sides of the frame, and are symmetrically installed according to the longitudinal horizontal plane of the whole vehicle and the transverse horizontal plane of the front axle.

[0034] Further solutions, such as Figure 1 , Figure 4 As shown, a leaf spring pressure plate 7 is provided in the middle area of ​​the top surface of the front leaf spring assembly 5 , and the leaf spring pressure plate 7 and the front leaf spring assembly 5 are fixed to the front axle 2 by at least one N-shaped bolt 9 .

[0035] The specific structure of the leaf spring pressure plate is further described below.

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the leaf spring pressure plate 7 is divided into three parts, specifically: at least one shock-absorbing hole is provided on the top surface of the middle part, and a center positioning hole 701 is provided on the bottom surface for avoiding the center positioning stud 501 installed on the front leaf spring assembly 5; a limit block 8 is provided directly above the front area, and the vertical downward projection area of ​​the limit block 8 is slightly smaller than the top surface area of ​​the front area (i.e., the leaf spring pressure plate contact surface 702 in the figure); the bottom surface of the front area is an inclined surface with a thick inner layer and a thin outer layer, which is used to avoid the fixing ring installed on the front leaf spring assembly 5; a limit block 8 is provided directly above the rear area, and the vertical downward projection area of ​​the limit block 8 is slightly smaller than the top surface area of ​​the rear area (i.e., the leaf spring pressure plate contact surface 702 in the figure); the bottom surface of the rear area is an inclined surface with a thick inner layer and a thin outer layer, which is used to avoid the fixing ring installed on the front leaf spring assembly 5.

[0037] Further solutions, such as Figure 3 As shown, the top surface dividing portion of the front area and the middle part and the top surface dividing portion of the rear area and the middle part are each provided with a groove 703 penetrating the leaf spring pressure plate along the longitudinal direction; two n-shaped bolts 9 are respectively embedded in the corresponding grooves 703.

[0038] It should be noted that the leaf spring pressure plate 7 is integrally cast and has good performance. The center positioning stud 501 at the top of the front leaf spring assembly 5 penetrates the center positioning hole 701 at the bottom of the leaf spring pressure plate 7, and the front leaf spring assembly 5 and the leaf spring pressure plate 7 are fixed to the front axle 2 by the n-type bolts 9.

[0039] Further solutions, such as Figure 1 As shown, a symmetrically arranged upper support of a cylinder shock absorber is installed on each of the outer sides of the frame 1 in the transverse direction, and the top of the cylinder shock absorber 6 is connected to the upper support of the cylinder shock absorber; the limit block 8 is fixed on the bottom surface of the upper support of the cylinder shock absorber.

[0040] Further solutions, such as Figure 1 , Figure 5 , Figure 6 As shown, the other end of the tie rod 3 is connected to a tie rod support 301 located on the front axle 2; the tie rod support 301 is an integral casting, and is provided with a tie rod support positioning hole 30101, which is used to cooperate with the positioning pin 201 on the front axle 2 and then fix the tie rod support 301 on the front axle 2 through bolts 302.

[0041] Further solutions, such as Figure 1As shown, the tie rod 3, two longitudinal thrust rods 4 and two tubular shock absorbers 6 are arranged at the front end of the front axle 2 in the longitudinal direction, and the steering actuator is arranged at the rear side of the front axle 2, with both sides keeping a certain distance from the tires, so that maintenance can be performed without removing the tires and axles. This arrangement is reasonable and the labor time for component replacement is short. The two longitudinal thrust rods 4, two tubular shock absorbers 6 and two front leaf spring assemblies 5 are arranged symmetrically with respect to the longitudinal center line of the frame 1.

[0042] In summary, the present invention provides a front suspension system, which is composed of a tie rod, multiple longitudinal thrust rods, multiple leaf springs, multiple cylinder shock absorbers, multiple limit blocks, etc.; it has a simple structure, strong reliability, meets the multi-directional constraint and elastic shock absorption functions, and can limit the vibration of the vehicle in multi-directional constraint and limit and the frame body, and improve the comfort and reliability of the vehicle. The front suspension components are arranged reasonably, and all components can be repaired without disassembling components such as tires and axles, and it is easy to disassemble and replace components and the replacement time is short.

[0043] The chassis provided by the present invention is described below. The chassis described below and the front suspension system described above can be referenced to each other.

[0044] A chassis provided by the present invention may include a front suspension system as described in any one of the above embodiments.

[0045] The beneficial effects achieved by the chassis provided by the present invention are consistent with the beneficial effects achieved by the front suspension system provided by the present invention, and will not be described in detail here.

[0046] The heavy-duty dump truck for mining provided by the present invention is described below. The heavy-duty dump truck for mining described below and the chassis described above can be referred to each other.

[0047] A heavy-load dump truck for mining provided by the present invention may include a chassis as described in any one of the above embodiments.

[0048] The beneficial effects achieved by the heavy-duty dump truck for mining provided by the present invention are consistent with the beneficial effects achieved by the chassis provided by the present invention, and will not be described in detail here.

[0049] like Figure 1As shown, when the mining heavy-duty dump truck is fully loaded with goods, the front leaf spring assembly 5 and the tubular shock absorber 6 are subjected to the stiffness deformation from the goods. When encountering obstacles on the road, the front axle 2 is subjected to the upward impact force of the ground, and the front leaf spring assembly 5 and the tubular shock absorber 6 absorb the impact force at the same time, causing it to be squeezed and deformed and transmitted to the frame. In order to extend the service life of the tubular shock absorber 6, the sum of the deformation of the front leaf spring 5 and the distance from the limit block 8 during transportation under full load should be less than the stroke of the tubular shock absorber 6. In this way, the leaf spring plays the main role in transmitting force, the limit block 8 plays the role of protecting the front leaf spring assembly 5, and the tubular shock absorber 6 also plays the role of auxiliary leaf spring. The limit block 8 and the tubular shock absorber 6 work together to protect the front leaf spring assembly 5 from early damage under impact conditions. Therefore, this system composition can increase the service life of the front leaf spring assembly and improve the reliability of the front suspension system.

[0050] When a mining heavy-duty dump truck is fully loaded with cargo, it needs emergency braking when encountering a large obstacle or a deep foundation pit on the road, or when turning sharply downhill with full load. The wheel brake of the front axle 2 performs braking. During the deceleration process of the front axle 2, the front leaf spring assembly 5 is restricted by the front and rear displacement because the leaf spring pressure plate 7 and the front leaf spring assembly 5 are directly fixed to the upper end of the front axle with n-type bolts 9. At this time, the lower part of the cylinder shock absorber 6 is directly connected to the front axle and is also subject to corresponding braking displacement. Since the rear end of the longitudinal thrust rod 4 is also directly fixed to the front axle 2, through the conduction of force, the front end of the longitudinal thrust rod 4 will limit the forward movement of the frame, so that the cylinder shock absorber 6 bracket is also restricted in movement. The above can ensure the displacement of the leaf spring assembly and the cylinder shock absorber in the front and rear directions, thereby limiting the large front and rear displacement of the whole vehicle during emergency braking, which is used to protect the leaf spring from damage under large shear force and the shortened life of the inner cylinder of the cylinder shock absorber when colliding with the piston.

[0051] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0052] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present invention and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0053] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A front suspension system, wherein the vehicle travel direction is set as the longitudinal direction, characterized in that: include: Two front leaf spring assemblies used as elastic elements are arranged on both sides of the vehicle in the transverse direction, the middle area of ​​the front leaf spring assembly is fixed to the front axle, and the two longitudinal ends of the front leaf spring assembly are fixed to the frame; Two cylinder shock absorbers are arranged at the middle area of ​​the outer side surfaces in the transverse direction of the two front leaf spring assemblies, and the tops thereof are connected to the vehicle frame, and the bottoms thereof are connected to the front axle; A tie rod is arranged between the two front leaf spring assemblies, one end of which is connected to the vehicle frame and the other end is connected to the front axle, and is used to bear the lateral force and displacement between the front axle and the vehicle frame; Two longitudinal thrust rods are arranged on both sides of the vehicle in the transverse direction, one end of which is connected to the frame and the other end is connected to the front axle, and are used to bear the longitudinal force and displacement between the front axle and the frame.

2. A front suspension system according to claim 1, characterized in that: Also includes: A limit block is installed on the vehicle frame above the front leaf spring assembly and is used to limit the vertical upward displacement of the front leaf spring assembly.

3. A front suspension system according to claim 2, characterized in that: Two limit blocks are arranged along the longitudinal direction of the front leaf spring assembly directly above the front leaf spring assembly, and the two limit blocks are symmetrically arranged about the transverse center line of the front leaf spring assembly.

4. A front suspension system according to claim 2, characterized in that: A leaf spring pressure plate is provided in the middle area of ​​the top surface of the front leaf spring assembly, and the leaf spring pressure plate and the front leaf spring assembly are fixed to the front axle by at least one N-shaped bolt.

5. A front suspension system according to claim 4, characterized in that: The leaf spring pressure plate is divided into three parts: The middle part has at least one shock-absorbing hole on the top surface and a center positioning hole on the bottom surface for avoiding the center positioning stud installed on the front leaf spring assembly; The front area has a stop block directly above it, and the vertical downward projection area of ​​the stop block is slightly smaller than the top area of ​​the front area; the bottom surface of the front area is a thick inner and thin outer inclined surface, which is used to avoid the fixing ring installed on the front leaf spring assembly; The rear area has a limit block directly above it, and the vertical downward projection area of ​​the limit block is slightly smaller than the top area of ​​the rear area; the bottom surface of the rear area is a slope that is thick inside and thin outside, which is used to avoid the fixing ring installed on the front leaf spring assembly.

6. A front suspension system according to claim 5, characterized in that: The top surface dividing portion between the front region and the middle portion and the top surface dividing portion between the rear region and the middle portion are each provided with a groove penetrating the leaf spring pressure plate along the longitudinal direction; the two N-shaped bolts are respectively embedded in the corresponding grooves.

7. A front suspension system according to claim 2, characterized in that: A symmetrically arranged upper support for a cartridge shock absorber is installed on each of the outer sides in the transverse direction of the frame, and the top of the cartridge shock absorber is connected to the upper support for the cartridge shock absorber; the limit block is fixed on the bottom surface of the upper support for the cartridge shock absorber.

8. The front suspension system according to claim 1, characterized in that: The other end of the tie rod is connected to a tie rod support located on the front axle; The tie rod support is an integral casting, and is provided with a tie rod support positioning hole, which is used to cooperate with a positioning pin on the front axle and then fix the tie rod support on the front axle through bolts.

9. The front suspension system according to claim 1, characterized in that: The tie rod, two longitudinal thrust rods and two cartridge shock absorbers are all arranged at the front end in the longitudinal direction of the front axle; The two longitudinal thrust rods, the two cylinder shock absorbers and the two front leaf spring assemblies are all arranged symmetrically with respect to the longitudinal center line of the vehicle frame.

10. A chassis, characterized in that: A front suspension system comprising any one of claims 1 to 9.

11. A heavy-load dump truck for mining, characterized in that: A front suspension system comprising any one of claims 1 to 9; or a chassis comprising claim 10.

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