A composite suspension structure for a snow plow and a design method thereof

Abstract

This invention relates to a composite suspension structure and design method for snowplows. In this invention, two parallel components, a leaf spring and a gas spring, are installed between the axle and the frame. The gas spring includes a cylinder assembly, an accumulator, a shut-off valve, and piping. The upper end of the cylinder assembly is connected to the frame, and the lower end is connected to the axle. The accumulator is connected in series with the cylinder assembly through piping and the shut-off valve. The composite suspension structure for snowplows is designed with parameters based on the requirements of the snowplow. This application combines the simplicity, reliability, and guiding characteristics of leaf springs with the nonlinear variable stiffness characteristics of gas springs, effectively improving vehicle smoothness during operation and solving the high-low vibration phenomenon caused by traditional leaf spring suspensions on uneven ground, thus improving snow removal efficiency. Furthermore, the hydraulic control adjustment system can be eliminated according to the actual axle load of the vehicle, allowing manual adjustment of the gas spring height and enabling mechanical locking, effectively solving the problem of excessive cost associated with gas suspensions.

Description

Technical Field

[0001] This invention relates to the field of snowplow suspension technology, and in particular to a composite suspension structure and design method for snowplows. Background Technology

[0002] Snow removal is an important task in winter, usually carried out by snowplows. Currently, most snowplows use mechanical snow removal methods. Snowplows are equipped with snow removal mechanisms (such as snowplows and snow rollers), which contact the snow on the road surface to remove it.

[0003] Snowplow chassis are mostly modified from ordinary commercial vehicles. Commercial vehicle chassis suspension systems typically use leaf spring suspensions. While leaf spring suspensions are simple in structure, low in cost, and their vibration damping performance generally meets vehicle requirements, they are passive suspensions and cannot freely adjust the vehicle body to achieve functions such as vehicle height adjustment, pitch control, automatic height adjustment, and rigid frame locking. High stability is required for the chassis during snow removal. Existing snowplow leaf spring suspensions produce height fluctuations when operating on uneven ground, causing snowplows and snowplow brushes to lift off the ground, affecting snow removal efficiency. Sometimes, the chassis must allow for adjustable frame height; for better snow removal, the frame height must remain constant during operation. Existing leaf spring suspensions do not meet the specific requirements for snowplow transportation, driving, and equipment operation. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, the present invention provides a composite suspension structure and design method for snowplows.

[0005] In a first aspect, the present invention provides a composite suspension structure for a snowplow vehicle, comprising: leaf springs with both ends connected to the vehicle frame and the middle fixed to the axle;

[0006] A hydropneumatic suspension is connected between the vehicle frame and the axle. The hydropneumatic suspension includes a cylinder assembly, which is connected to an accumulator via a pipeline equipped with a shut-off valve.

[0007] The target offset frequency for the composite suspension structure of the snowplow is configured to maintain a fully loaded state when used in snowplow operations. The target stiffness of the composite suspension structure of the snowplow is designed based on the target offset frequency. Under the condition of meeting the preset requirements of the load ratio of the leaf spring and the hydropneumatic suspension, the overall vehicle height, and the angle of the transmission system of the snowplow, the stiffness of the leaf spring is determined. The full-load static balance stiffness of the hydropneumatic suspension is obtained by subtracting the stiffness of the leaf spring from the target stiffness. The initial inflation volume and pressure are determined based on the full-load static balance stiffness of the hydropneumatic suspension and the specifications of the hydropneumatic suspension used.

[0008] Furthermore, the leaf spring is a multi-leaf spring, which is composed of leaf springs that are thin at both ends, thick in the middle, and of equal width and length. One end of the leaf spring is connected to a first leaf spring support fixed to the frame by bolts. The other end of the leaf spring is connected to a second leaf spring support fixed to the frame by lugs. The straight section in the middle of the leaf spring is fixed to the axle by U-bolts and a spring pressure plate. A leaf spring pad is provided between the axle and the leaf spring.

[0009] Furthermore, the top of the cylinder assembly is provided with a spherical bearing structure, which is connected to the upper cylinder support fixed on the frame via a pin. The bottom of the cylinder assembly is provided with a spherical pin structure, which is bolted to the lower cylinder support on the axle.

[0010] Furthermore, the lower support of the hydraulic cylinder is integrated with the leaf spring pad disposed between the axle and the frame, and the bottom of the lower support of the hydraulic cylinder is provided with a support connected to the axle.

[0011] Furthermore, a lateral stabilizer bar assembly is installed on the axle, and the lateral stabilizer bar assembly is fixedly connected to the vehicle frame via a balance clamp.

[0012] Furthermore, the accumulator has a piston-type structure.

[0013] Furthermore, the target offset frequency is set to be no less than 2.0 Hz, according to the formula k = (2πf) 2 *m calculates the target stiffness of the composite suspension structure for the snowplow, f is the target off-frequency, k is the target stiffness of the composite suspension structure for the snowplow, and m is the full load mass.

[0014] Furthermore, given that the snowplow's preset requirements for the load-bearing ratio of the leaf spring to the hydropneumatic suspension, the overall vehicle height, and the transmission system angle are met, the change d from the free arc height to the full-load arc height of the leaf spring is determined. Then, the stiffness of the leaf spring is calculated using the formula k1 = m1g / d, where k1 is the stiffness of the leaf spring and m1 is the load capacity of the leaf spring, calculated based on the full-load mass and load-bearing ratio.

[0015] Furthermore, determining the initial inflation volume and pressure based on the full-load static balance stiffness of the hydropneumatic suspension and the specifications of the hydropneumatic suspension used includes:

[0016] Based on the overall vehicle layout space and the arc height of the leaf springs, the specifications of the cylinder assembly are selected to meet the dynamic stroke of the suspension system, and the maximum mechanical stroke and oil discharge of the cylinder assembly are determined.

[0017] Based on the maximum mechanical stroke of the cylinder assembly, the oil discharge of the cylinder assembly, and the allowable compression ratio of the piston accumulator, and in conjunction with standard accumulator selection, the initial volume V of the accumulator is determined. g0 ;

[0018] From formula P c =m2g / A This is used to calculate the pressure of the hydropneumatic suspension at the fully loaded static equilibrium position, where P is... c The pressure of the hydro-pneumatic suspension at the fully loaded static balance position is m2, which is the load capacity of the hydro-pneumatic suspension at the fully loaded static balance position, calculated based on the full load mass and load ratio, and A is the piston rod area of ​​the cylinder assembly.

[0019] Based on formula V g =rP c A / k2 is used to calculate the gas volume of the accumulator under full-load static equilibrium conditions, where r is the gas polytropic coefficient, and V g This represents the gas volume of the accumulator under full-load static equilibrium conditions.

[0020] The initial inflation pressure is calculated based on the gas law, i.e., P. g0 =P c ×V g / V g0 .

[0021] Secondly, the present invention provides a design method applied to the design process of the aforementioned composite suspension structure with locking function for snowplows, comprising:

[0022] The target offset frequency is configured for the composite suspension structure of the snowplow vehicle to maintain a fully loaded state when used in snowplow vehicles, and the target stiffness of the composite suspension structure of the snowplow vehicle is determined based on the target offset frequency;

[0023] The leaf spring stiffness is determined under the premise of meeting the preset load ratio of leaf spring to air suspension, overall vehicle height and transmission system angle requirements in the composite suspension structure for snowplows.

[0024] The full-load static balance stiffness of the hydro-pneumatic suspension is obtained by subtracting the stiffness of the leaf spring from the target stiffness.

[0025] The initial inflation volume and pressure are determined based on the full-load static balance stiffness of the hydro-pneumatic suspension and the specifications of the hydro-pneumatic suspension used.

[0026] The technical solutions provided in the embodiments of the present invention have the following advantages compared with the prior art:

[0027] This invention provides a composite suspension structure and design method for snowplows, including leaf springs and gas springs. The leaf spring has a straight section in the middle connected to the axle, and both ends are connected to the longitudinal beams of the vehicle frame. The gas spring includes a cylinder assembly, an accumulator, a shut-off valve, and pipelines. The upper end of the cylinder assembly is connected to the vehicle frame, and the lower end is connected to the axle. The accumulator is connected in series with the cylinder assembly through pipelines and the shut-off valve. The composite suspension structure for snowplows is designed with parameters based on the requirements of the snowplow. By connecting the leaf springs in parallel with the gas springs, the simplicity, reliability, and guiding characteristics of the leaf springs are combined with the nonlinear variable stiffness characteristics of the gas springs, effectively improving the smoothness of vehicle operation and solving the high-low vibration phenomenon caused by traditional leaf spring suspensions when operating on uneven ground, thus improving snow removal efficiency. Furthermore, the hydraulic control adjustment system can be eliminated according to the actual axle load of the vehicle, and the height of the gas springs can be manually adjusted, achieving mechanical locking, effectively solving the problem of excessive cost of using gas suspensions. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a composite suspension structure for a snowplow provided in an embodiment of the present invention;

[0031] Figure 2 A flowchart illustrating the design of a composite suspension structure for a snowplow provided in an embodiment of the present invention;

[0032] Figure 3 This is a flowchart for determining the initial charging pressure of an energy accumulator, provided as an embodiment of the present invention.

[0033] The labels and their meanings in the attached diagram are as follows:

[0034] 1. Leaf spring, 2. U-bolt, 3. Spring pressure plate, 4. Axle, 5. Frame, 6. Hydraulic cylinder assembly, 7. Accumulator, 8. Shut-off valve, 9. Pipeline, 10. Bolt, 11. First leaf spring support, 12. Lifting lug, 13. Second leaf spring support, 14. Pin, 15. Upper hydraulic cylinder support, 16. Lower hydraulic cylinder support, 17. Leaf spring pad, 18. Support bracket, 19. Lateral stabilizer bar assembly, 20. Balance clamp. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] Example 1

[0038] See Figure 1 As shown, this embodiment of the invention provides a composite suspension structure for a snowplow. The composite suspension structure for a snowplow provided by this invention adopts a composite structure of leaf springs and hydropneumatic suspension. It includes: a leaf spring 1 connected to the frame 5 at both ends and fixed to the axle 4 in the middle; as a preferred embodiment, the leaf spring 1 is a multi-leaf spring, which is composed of spring leaves that are thin at both ends, thick in the middle, and of equal width and length; one end of the leaf spring 1 is connected to a first leaf spring support 11 fixed to the frame 5 by bolts 10; the other end of the leaf spring 1 is connected to a second leaf spring support 13 fixed to the frame 5 by a lug 12; the straight section in the middle of the leaf spring 1 is fixed to the axle 4 by U-bolts 2 and a spring pressure plate 3, and a leaf spring pad 17 is provided between the axle 4 and the leaf spring 1. The top of the leaf spring 1 is provided with the spring pressure plate 3, and the saddle bolt 2 fixes the leaf spring 1 to the leaf spring pad 17 through the spring pressure plate 3. The leaf spring pad 17 is fixed to the axle 4.

[0039] The air suspension connects the frame 5 and the axle 4. The air suspension includes a cylinder assembly 6, which is connected to an accumulator 7 via a pipe 9 with a shut-off valve 8. The accumulator 7 is a piston-type structure. The accumulator 7 and the shut-off valve 8 are fixed to the frame 5. The air suspension and the leaf spring 1 support the frame 5 on the axle 4 in parallel.

[0040] In specific implementation, the top of the cylinder assembly 6 is provided with a spherical bearing structure, which is connected to the upper cylinder support 15 fixed on the frame 5 via a pin 14. The bottom of the cylinder assembly 6 is provided with a spherical pin structure, which is bolted to the lower cylinder support 16 on the axle 4. To ensure the connection strength between the air suspension and the axle 4, the lower cylinder support 16 is integrated with the leaf spring pad 17 located between the axle 4 and the frame 5, and the bottom of the lower cylinder support 16 is provided with a support 18 connected to the axle 4.

[0041] In a preferred embodiment, a lateral stabilizer bar assembly 19 is provided on the axle 4. The lateral stabilizer bar assembly 19 and the hydropneumatic suspension are located on both sides of the axle 4. The lateral stabilizer bar assembly 19 is fixedly connected to the frame 5 via a balance clamp 20. This improves the lateral stability of the composite suspension structure used in snowplows.

[0042] See Figure 2 As shown, the parameters of the composite suspension structure for the snowplow are designed to meet the requirements of snowplow use, including:

[0043] S100, the target frequency of the composite suspension structure for the snowplow is configured to maintain a fully loaded state during snowplow use, and the target stiffness of the composite suspension structure for the snowplow is designed based on the target frequency; as a preferred embodiment, the target frequency is not lower than 2.0 Hz, according to the formula k = (2πf). 2 *m is calculated, where f is the target off-frequency, k is the target stiffness of the composite suspension structure for the snowplow, and m is the full-load mass. The full-load mass m, a known value, is a design specification for the snowplow. Example: For a 4×4 snowplow under full load, the single-sided load m = 5900 kg. From equation one, the stiffness k of the composite suspension structure for the snowplow is 931.69 N / mm.

[0044] S200, under the premise of meeting the preset requirements of the load ratio of the leaf spring to the air suspension, the overall vehicle height and the angle of the transmission system of the snowplow, determine the stiffness of the leaf spring 1.

[0045] Specifically, given that the snowplow's preset requirements for the load-bearing ratio of the leaf spring 1 to the hydropneumatic suspension, the overall vehicle height, and the transmission system angle are met, the change in the free arc height (d) of the leaf spring 1 from its free arc height to its full-load arc height is determined. The leaf spring stiffness is then calculated using the formula k1 = m1g / d, where k1 is the leaf spring stiffness and m1 is the leaf spring load capacity, calculated based on the full-load mass and load-bearing ratio. For example, in an embodiment where the leaf spring to hydropneumatic suspension load-bearing ratio is 1:1, since the leaf spring and hydropneumatic suspension provide parallel support, m1 is half the full-load mass (m). Example: The 4×4 snowplow requires a ground clearance of 1250mm for the lower wing surface of the frame under full load, and the maximum included angle of the transmission system is no greater than 4°. If the change in the free arc height of the leaf spring from its free arc height to its full-load arc height (d) is determined to be 100mm, then the leaf spring stiffness (k1) is 289.1 N / mm².

[0046] S300, the target stiffness minus the leaf spring stiffness yields the full-load static balance stiffness of the hydropneumatic suspension, i.e., k2 = k - k1. Example: The full-load static balance stiffness k2 of the hydropneumatic spring in the 4×4 snowplow is 642.59 N / mm.

[0047] S400, determine the initial inflation volume and pressure based on the full-load static balance stiffness of the hydropneumatic suspension and the specifications of the hydropneumatic suspension used. For specific implementation details, please refer to [reference needed]. Figure 3 As shown, determining the initial inflation volume and pressure based on the full-load static balance stiffness of the hydropneumatic suspension and the specifications of the hydropneumatic suspension used includes:

[0048] S401, based on the overall vehicle layout space and the leaf spring arc height, select the specifications (length, cylinder diameter, piston rod diameter) of the cylinder assembly to meet the suspension system's dynamic stroke, and determine the maximum mechanical stroke and oil discharge of the cylinder assembly.

[0049] S402, based on the maximum mechanical stroke of the cylinder assembly, the oil discharge of the cylinder assembly, and the allowable compression ratio of the piston-type accumulator, and in conjunction with standard accumulator selection, determine the initial volume V of the accumulator. g0 The accumulator is filled with nitrogen gas. For example, considering the layout space and leaf spring arc height of the 4×4 snowplow, to satisfy the dynamic stroke of the suspension system, the piston rod diameter of the cylinder assembly is selected to be 80mm, the cylinder diameter to be 100mm, and the maximum mechanical stroke to be 186mm. Based on the maximum mechanical stroke of the cylinder, the cylinder displacement L≈0.93L is calculated. A piston-type accumulator with an allowable compression ratio of 4:1 is selected. Combining this with standard accumulator selection, the initial volume V of the accumulator is determined. g0 =1L.

[0050] S403, from formula P c =m2g / A This is used to calculate the pressure of the hydropneumatic suspension at the fully loaded static equilibrium position, where P is... cThe pressure of the hydropneumatic suspension at its full-load static equilibrium position is given by m2, which is the load capacity of the hydropneumatic suspension at this position, calculated based on the full-load mass and load ratio. A is the piston rod area of ​​the cylinder assembly. The pressure of the hydropneumatic suspension at its full-load static equilibrium position also acts on the accumulator. For example, under a 1:1 load ratio, in the fully loaded state of the 4×4 snowplow, the single-sided load mass m2 of the hydropneumatic spring is 2950 kg, and the piston rod area A of the cylinder assembly is 5026.55 mm². 2 The hydraulic cylinder pressure P at the fully loaded static equilibrium position of the gas spring is... c It is 5.75 MPa.

[0051] S404, based on formula V g =rP c A / k2 is used to calculate the gas volume of the accumulator under full-load static equilibrium state, r is the gas polytropic coefficient (based on engineering experience, the slow loading of the oil-gas spring is regarded as an isothermal process, and its value is taken as 1.0), V g This represents the gas volume of the accumulator under full-load static equilibrium conditions.

[0052] S405, calculates the initial inflation pressure based on the gas law, i.e.: P g0 =P c ×V g / V g0 In the example, the initial inflation pressure P of the 4×4 snowplow is... g0 ≈2.59MPa.

[0053] Example 2

[0054] This invention provides a design method applied to the design process of a composite suspension structure with locking function for snowplows, comprising:

[0055] The target offset frequency is configured for the composite suspension structure of the snowplow vehicle to be used under full load, and the target stiffness of the composite suspension structure of the snowplow vehicle is determined based on the target offset frequency.

[0056] The leaf spring stiffness is determined while meeting the preset requirements for the load-bearing ratio of leaf spring to air suspension, the overall height of the snowplow, and the angle of the transmission system in the composite suspension structure for the snowplow.

[0057] The full-load static balance stiffness of the hydro-pneumatic suspension is obtained by subtracting the stiffness of the leaf spring from the target stiffness.

[0058] The initial inflation volume and pressure are determined based on the full-load static balance stiffness of the hydropneumatic suspension and the specifications of the adopted hydropneumatic suspension. Specifically, this includes: selecting the specifications (length, cylinder diameter) of the cylinder assembly based on the vehicle layout space and the leaf spring arc height, ensuring sufficient dynamic stroke of the suspension system; determining the maximum mechanical stroke and oil displacement of the cylinder assembly; and, based on the maximum mechanical stroke, oil displacement, and allowable compression ratio of the piston-type accumulator, combined with standard accumulator selection, determining the initial volume V of the accumulator. g0 The accumulator is filled with nitrogen gas. (From formula P) c =m2g / A This is used to calculate the pressure of the hydropneumatic suspension at the fully loaded static equilibrium position, where P is... c The pressure of the hydropneumatic suspension at its full-load static equilibrium position is given by V. m2 represents the load capacity of the hydropneumatic suspension at this position, calculated based on the full-load mass and load ratio. A is the piston rod area of ​​the cylinder assembly. The pressure of the hydropneumatic suspension at its full-load static equilibrium position acts on the accumulator. Based on formula V... g =rP c A / k2 is used to calculate the gas volume of the accumulator under full-load static equilibrium conditions, where r is the gas polytropic coefficient, and V g Let P be the gas volume of the accumulator under full-load static equilibrium conditions. The initial charging pressure is calculated based on the gas law, i.e., P. g0 =P c ×V g / V g0 .

[0059] In the embodiments provided by this invention, it should be understood that the disclosed structures and methods can be implemented in other ways. For example, the structural embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, structures, or units, and may be electrical, mechanical, or other forms.

[0060] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0061] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0062] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A design method for a composite suspension structure for a snowplow, characterized in that, The methods include: The snowplow uses a composite suspension structure, which includes: leaf springs (1) connected at both ends to the frame (5) and fixed in the middle to the axle (4); a hydropneumatic suspension is connected between the frame (5) and the axle (4), which includes: a cylinder assembly (6), which is connected to an accumulator (7) through a pipe (9) with a shut-off valve (8); a lateral stabilizer bar assembly (19) is provided on the axle (4), which is fixedly connected to the frame (5) through a balance clamp (20); The target frequency of the composite suspension structure for the snowplow is configured to maintain a fully loaded state during snowplow use. The target stiffness of the composite suspension structure is determined based on this target frequency. The target frequency is set to be no less than 2.0 Hz, according to the formula... Calculate the target stiffness of the composite suspension structure for the snowplow. For the target frequency offset, The target stiffness is the composite suspension structure for the snowplow. Full load mass; Under the condition of satisfying the preset load ratio of the leaf spring to the air suspension, the overall height of the snowplow, and the angle requirements of the transmission system in the composite suspension structure for the snowplow, the stiffness of the leaf spring is determined; wherein, under the condition of satisfying the preset load ratio of the leaf spring (1) to the air suspension, the overall height of the snowplow, and the angle requirements of the transmission system, the change in the free arc height to the full-load arc height of the leaf spring (1) is determined. Then by formula Calculate the stiffness of the leaf spring, where, For the stiffness of the leaf spring, The load capacity of the leaf spring is calculated based on the full load mass and load ratio. The full-load static balance stiffness of the hydropneumatic suspension is obtained by subtracting the stiffness of the leaf spring from the target stiffness. The initial inflation volume and pressure are determined based on the full-load static balance stiffness of the hydropneumatic suspension and the specifications of the hydropneumatic suspension used, including: Based on the vehicle layout space and leaf spring arc height, the specifications of the cylinder assembly are selected to meet the dynamic travel requirements of the suspension system. The maximum mechanical stroke and oil displacement of the cylinder assembly are then determined. Based on the maximum mechanical stroke, oil displacement, and allowable compression ratio of the piston accumulator, and in conjunction with standard accumulator selection, the initial volume of the accumulator is determined. ; From the formula The pressure of the hydropneumatic suspension at the fully loaded static equilibrium position is calculated using the formula: The pressure of the hydropneumatic suspension at the fully loaded static balance position. The load capacity of the hydropneumatic suspension at its full-load static equilibrium position is calculated based on the full-load mass and load ratio, where A is the piston rod area of ​​the cylinder assembly; based on the formula... The gas volume of the accumulator under full-load static equilibrium condition was calculated. For gas polytropic coefficients, The gas volume of the accumulator under full-load static equilibrium conditions; the initial charging pressure is calculated based on the gas law, i.e.: .

2. The composite suspension structure design method for snowplows according to claim 1, characterized in that, The leaf spring (1) is a multi-leaf spring, which is composed of leaf springs that are thin at both ends, thick in the middle, and of equal width and length. One end of the leaf spring (1) is connected to the first leaf spring support (11) fixed on the frame (5) by a bolt (10). The other end of the leaf spring (1) is connected to the second leaf spring support (13) fixed on the frame (5) by a lug (12). The straight section in the middle of the leaf spring (1) is fixed to the axle (4) by a U-bolt (2) and a spring pressure plate (3). A leaf spring pad (17) is provided between the axle (4) and the leaf spring (1).

3. The composite suspension structure design method for snowplows according to claim 1, characterized in that, The top of the cylinder assembly (6) is provided with a spherical bearing structure, which is connected to the upper cylinder support (15) fixed on the frame (5) via a pin (14). The bottom of the cylinder assembly (6) is provided with a spherical pin structure, which is bolted to the lower cylinder support (16) fixed on the axle (4).

4. The composite suspension structure design method for snowplows according to claim 3, characterized in that, The lower cylinder support (16) is integrated with the leaf spring pad (17) located between the axle (4) and the frame (5). The bottom of the lower cylinder support (16) is provided with a support support (18) connected to the axle (4).

5. The composite suspension structure design method for snowplows according to claim 1, characterized in that, The accumulator (7) has a piston-type structure.

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