Plate spring base, plate spring suspension system and vehicle

Abstract

The embodiment of the utility model provides a plate spring base, a plate spring suspension system and a vehicle, and belongs to the technical field of plate spring suspension systems, the plate spring base is used for being installed between an axle and a plate spring of the vehicle, and the plate spring base is prepared from polyamide and comprises a first installation face and a second installation face, the second mounting slope is used for being arranged on the side, facing the plate spring, of the plate spring base, the ends, close to each other, of the first mounting face and the second mounting slope form the thin end of the plate spring base, and the thin end is arranged in the vehicle advancing direction. The plate spring base is made of polyamide materials, light weight is achieved, meanwhile, the included angle is formed between the first installation face and the second installation inclined face, the thin end of the plate spring base is arranged towards the advancing direction of a vehicle, the caster angle of a main pin is guaranteed, and the plate spring base is used for resetting wheels and improving the stability of linear driving; steering force applied to the steering wheel by a driver is reduced, and vehicle driving stability is improved.

Description

Technical Field

[0001] The present application relates to the technical field of leaf spring suspension systems, and in particular to a leaf spring base, a leaf spring suspension system and a vehicle. Background Art

[0002] The leaf spring suspension system is a vehicle component that connects the frame and the axle. It is installed on the vehicle chassis and can alleviate the vibration and impact of the vehicle during driving. It is mainly composed of leaf springs, upper covers, U-bolts, bases, etc. The base can be used to increase the ground clearance of the vehicle and the roll height of the vehicle. At the same time, it can avoid excessive deformation caused by excessive impact loads, and play a buffering role to protect the leaf spring structure.

[0003] The existing leaf spring base is mainly made of QT450 material, with a strength level of more than 450MPa and an elongation of more than 10%. The structure is designed as a rectangular structure with parallel upper and lower sections. The leaf spring base of the above structure can generally meet the product performance of the vehicle.

[0004] However, as the requirements for strength and lightweight of vehicles continue to increase, the traditional QT450 leaf spring base, which is mainly made of steel, can no longer meet the needs of lightweight vehicles. How to achieve lightweighting of the vehicle chassis while meeting the requirements of strength and vehicle driving performance is an urgent problem that needs to be solved. Utility Model Content

[0005] The embodiments of the present application provide a leaf spring base, a leaf spring suspension system and a vehicle. The material of the leaf spring base is high-strength polyamide. While achieving lightweight of the vehicle chassis, the first mounting surface and the second mounting inclined surface are arranged at an angle, and the thin end of the leaf spring base is arranged toward the forward direction of the vehicle to ensure the kingpin castor angle, which is used to reset the wheels and improve the stability of straight-line driving, reduce the steering force applied by the driver on the steering wheel, and improve the driving stability of the vehicle.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a leaf spring base, which is used to be installed between an axle and a leaf spring of a vehicle, and the leaf spring base is made of polyamide, including:

[0008] A first mounting surface, used to be arranged on a side of the leaf spring base facing the axle;

[0009] The second installation bevel is used to be arranged on the side of the leaf spring base facing the leaf spring, and the end where the first installation surface and the second installation bevel are close to each other forms a thin end of the leaf spring base, and the thin end is arranged in the direction of vehicle travel.

[0010] Based on the above technical solution, the present application can also be improved as follows.

[0011] In one embodiment, the included angle range between the first mounting surface and the second mounting inclined surface is 2° to 4°, and the included angle is set at 2° to 4°.

[0012] In one embodiment, a rounded corner is provided on the circumferential edge of the leaf spring base along the plumb direction of the first mounting surface, and the arc of the rounded corner is 3° to 5°.

[0013] In one embodiment, the second installation inclined surface is provided with inclined surfaces on both sides along the length direction of the leaf spring base, the inclined surfaces are close to the edge in the length direction of the leaf spring base, and are inclined toward the direction of the first installation surface, and / or,

[0014] Inclined surfaces are arranged on both sides of the first installation surface along the length direction of the leaf spring base. The inclined surfaces are close to the edges of the leaf spring base in the length direction and are inclined toward the direction of the second installation inclined surface.

[0015] In one embodiment, the depth of the inclined surface along the plumb direction of the first mounting surface is 3 mm to 5 mm.

[0016] In one embodiment, a blind hole is disposed on the first mounting surface, and the depth of the blind hole ranges from 12 mm to 16 mm.

[0017] In one embodiment, a blind hole is disposed on the second installation inclined surface, and the depth of the blind hole ranges from 12 mm to 16 mm.

[0018] In one embodiment, a through hole is provided through the leaf spring base for connecting the axle and the leaf spring via a connecting member.

[0019] In one embodiment, there are four through holes arranged in a square shape, wherein the distance between two adjacent through holes along the length direction of the leaf spring base is 70 mm to 90 mm, and the distance between two adjacent through holes along the width direction of the leaf spring base is 30 mm to 50 mm.

[0020] In one embodiment, the materials of polyamide include: caprolactam, sodium methoxide, sodium hydroxide, isocyanate, ultrafine molybdenum disulfide powder, hollow glass microspheres and talcum powder, the weight of caprolactam accounts for 90% to 92% of the weight of polyamide, the weight of sodium methoxide accounts for 2% to 4% of the weight of polyamide, the weight of sodium hydroxide accounts for 1.5% to 2% of the weight of polyamide, the weight of isocyanate accounts for 3% to 3.5% of the weight of polyamide, the weight of ultrafine molybdenum disulfide accounts for 0.2% to 0.5% of the weight of polyamide, and the sum of the weight of hollow glass microspheres and talcum powder accounts for 0.5% to 0.8% of the weight of polyamide.

[0021] A second aspect of an embodiment of the present application provides a leaf spring suspension system, including the leaf spring base mentioned above, the leaf spring suspension system also includes a leaf spring and an axle, and a leaf spring base is arranged between the leaf spring and the axle.

[0022] A third aspect of an embodiment of the present application further provides a vehicle, comprising the above-mentioned leaf spring suspension system, the vehicle also comprising a chassis system, and the leaf spring suspension system is installed on the chassis system.

[0023] The leaf spring base, leaf spring suspension system and vehicle provided in the embodiment of the present application are used to be installed between the axle and leaf spring of the vehicle. The leaf spring base is made of polyamide and includes: a first mounting surface, which is used to be set on the side of the leaf spring base facing the axle; a second mounting bevel, which is used to be set on the side of the leaf spring base facing the leaf spring. The first mounting surface and the second mounting bevel are close to each other to form a thin end of the leaf spring base, and the thin end is set in the direction of the vehicle. The vehicle includes a leaf spring suspension system with a leaf spring base installed. The leaf spring base made of polyamide in the present application effectively reduces the weight compared with the steel leaf spring base in the prior art, and realizes lightweight product. In addition, the first mounting surface and the second mounting bevel are set at an angle, and the thin end of the leaf spring base is set in the direction of the vehicle to ensure the castor angle, which is used to reset the wheel and improve the stability of straight-line driving, reduce the steering force applied by the driver on the steering wheel, and improve the driving stability of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the structure of a leaf spring base provided in one embodiment of the present application;

[0026] Figure 2 for Figure 1 Schematic diagram of the cross section of AA;

[0027] Figure 3 A schematic structural diagram of a leaf spring base provided in another angle according to an embodiment of the present application;

[0028] Figure 4 A schematic diagram of the structure of a leaf spring suspension system provided in one embodiment of the present application;

[0029] Figure 5 A schematic diagram of the partial structure of a vehicle chassis provided in one embodiment of the present application.

[0030] Description of reference numerals:

[0031] 100-leaf spring base;

[0032] 110-first mounting surface; 120-second mounting inclined surface; 130-thin end; 150-rounded corner; 160-inclined surface; 170-through hole; 111-first blind hole; 121-second blind hole;

[0033] 200-axle;

[0034] 300-leaf spring;

[0035] 400-Vehicles;

[0036] 410 - Chassis system. DETAILED DESCRIPTION

[0037] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, nor can they be understood as describing a specific order or sequence. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0040] As described in the background technology, the existing leaf spring base is mainly made of cast iron QT450 material, and its strength level and elongation can generally meet the performance requirements of vehicle use. However, as the chassis performance requirements of vehicles become higher and higher, how to develop a high-strength, high-impact and low-cost leaf spring base that meets the chassis performance requirements is an urgent problem to be solved.

[0041] In order to solve the technical problems raised above, the present application provides a leaf spring base, a leaf spring suspension system and a vehicle. The material of the leaf spring base is polyamide. While achieving lightweight of the vehicle chassis, the first mounting surface and the second mounting inclined surface are arranged at an angle, and the thin end of the leaf spring base is arranged toward the forward direction of the vehicle to ensure the kingpin castor angle, which is used to reset the wheels and improve the stability of straight-line driving, reduce the steering force applied by the driver on the steering wheel, and improve the driving stability of the vehicle.

[0042] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0043] See attached Figure 1 To Attachment Figure 4 An embodiment of the present application provides a leaf spring base 100 for installation between an axle 200 and a leaf spring 300 of a vehicle. The leaf spring base 100 is made of polyamide and includes: a first installation surface 110 for being arranged on a side of the leaf spring base 100 facing the axle 200; a second installation inclined surface 120 for being arranged on a side of the leaf spring base 100 facing the leaf spring 300. One end where the first installation surface 110 and the second installation inclined surface 120 are close to each other forms a thin end 130 of the leaf spring base 100, wherein the thin end 130 is relative to the other end of the leaf spring base 100, the thickness of the thin end 130 is less than the thickness of the other end of the leaf spring base 100, and the thin end 130 is arranged toward the forward direction of the vehicle to form a castor angle. In this embodiment, the leaf spring base 100 is made of polyamide. From the perspective of light weight and cost, the basic data of the leaf spring base 100 made of polyamide and the traditional cast iron Q235 leaf spring base are analyzed. The analysis results are shown in Table 1 below. It can be clearly seen that the weight of the leaf spring base 100 made of polyamide is 1.41 kg, which is more than 71% lighter than the cast iron Q235 material. On the other hand, it also achieves a 6% cost reduction. From a comprehensive product perspective, the leaf spring base 100 made of polyamide achieves lightweight vehicle chassis while reducing costs.

[0044] Table 1 Parts lightweighting and cost analysis

[0045]

[0046] In one embodiment, while achieving lightweight of the leaf spring base 100, in order to meet product performance and achieve high strength and high impact performance requirements, the leaf spring base 100 is structurally optimized. Specifically, the leaf spring base 100 is a solid rectangular parallelepiped structure, which can effectively reduce excessive deformation of the leaf spring base 100 when it is impacted. Figure 1 The AA section shown is formed as Figure 2The "small trapezoid" folding surface structure shown, the thin end 130 of the "small trapezoid" is arranged toward the driving direction of the vehicle to form the vehicle's kingpin castor angle, that is, its first mounting surface 110 and the second mounting inclined surface 120 are not designed to be parallel, and the two have a certain angle deviation design. Optionally, the first mounting surface 110 and the second mounting inclined surface 120 have an angle range of 2° to 4°, that is, the angle between the first mounting surface 110 and the second mounting inclined surface 120 can be 2° to 3°, 3° to 4°, and the angle between the first mounting surface and the second mounting inclined surface in this embodiment is 3°. Since the thin end 130 of the "small trapezoid" is arranged toward the driving direction of the vehicle, from the side of the vehicle, the wheel steering axis is tilted backward from the vertical direction at an angle, that is, the kingpin castor angle is formed. The vehicle can use the self-aligning torque generated by the kingpin castor angle to automatically align the vehicle steering wheel if the vehicle encounters an external force during driving, so as to reset the wheel and improve the stability of straight-line driving.

[0047] In one embodiment, the material polyamide for preparing the leaf spring base 100 includes: caprolactam, sodium methoxide, sodium hydroxide, isocyanate, ultrafine molybdenum disulfide powder, hollow glass microspheres and talcum powder, the weight of caprolactam accounts for 90% to 92% of the weight of the polyamide, and in this embodiment, the weight of caprolactam can be selected to account for 91% of the weight of the polyamide; the weight of sodium methoxide accounts for 2% to 4% of the weight of the polyamide, and in this embodiment, the weight of sodium methoxide can be selected to account for 3% of the weight of the polyamide; the weight of sodium hydroxide accounts for 1.5% to 2% of the weight of the polyamide, and in this embodiment, the weight of sodium hydroxide can be selected to account for 1.7% or 1.8%; the weight of isocyanate accounts for 3% to 3.5% of the weight of polyamide. In this embodiment, the weight of isocyanate can be selected to account for 3.2% or 3.3% of the weight of polyamide; the weight of ultrafine molybdenum disulfide powder accounts for 0.2% to 0.5% of the weight of polyamide. In this embodiment, the weight of ultrafine molybdenum disulfide powder can be selected to account for 0.3% or 0.4% of the weight of polyamide; the sum of the weight of hollow glass microspheres and talcum powder accounts for 0.5% to 0.8% of the weight of polyamide. In this embodiment, the sum of the weight of hollow glass microspheres and talcum powder can be selected to account for 0.6% or 0.7% of the weight of polyamide.

[0048] Based on the above material weight ratio, the leaf spring base 100 is prepared. 90% to 92% of the caprolactam monomer in the formula is melted at 90°C, and the temperature is continuously raised to about 135°C, and vacuuming is started. The pressure is reduced to a vacuum gauge indicating more than 100kPa, and the mixture is boiled for 10 to 15 minutes. After the normal pressure is restored, 2 to 4% of sodium methoxide and 1.5 to 2% of sodium hydroxide are added; vacuuming is performed, and a dehydration reaction is performed at 135 to 140°C for 15 to 20 minutes, and the temperature is adjusted to the polymerization temperature after the boiling point is constant. 3 to 3.5% of isocyanate, 0.2 to 0.5% of ultrafine molybdenum disulfide, and 0.5 to 0.8% of hollow glass microspheres and talcum powder are added, and the mixture is stirred vigorously for 1 minute. The stirred solution is then quickly poured into a mold preheated to 160 to 180°C, and the mixture is kept warm for 30 minutes. When the temperature is constant, the power supply is cut off, and the mixture is demoulded after cooling for 30 minutes. After the above-mentioned material ratio and preparation process, after CAE simulation analysis, the performance requirements of tensile strength ≥70MPa; compressive strength ≥130MPa, and elongation ≥10% can be achieved, and a modified high-strength polyamide leaf spring base 100 for vehicles that meets the requirements of lightweight and cost-effectiveness is obtained.

[0049] In one embodiment, the leaf spring base 100 is provided with a fillet 150 along the circumferential edge of the first mounting surface 110 in the plumb direction, and the arc of the fillet 150 is 3° to 5°. Specifically, the plumb direction of the first mounting surface 110 is based on Figure 2 In the Y direction of the orientation shown, the circumference of the leaf spring base 100 along the Y direction is rounded. Optionally, four rounded corners are provided in this embodiment, and the arc range of each rounded corner is 3° to 5°. Optionally, the arc of the rounded corner in this embodiment is 4°. By rounding the corners, the stress concentration of the leaf spring base 100 when subjected to force can be eliminated, so that the stress is more evenly distributed, and the fatigue strength of the leaf spring base is improved.

[0050] In one embodiment, the second installation inclined surface 120 is provided with inclined surfaces 160 on both sides along the length direction of the leaf spring base 100, and the inclined surfaces 160 are inclined toward the direction of the first installation surface 110, and / or, the first installation surface 110 is provided with inclined surfaces 160 on both sides along the length direction of the leaf spring base 100, and the inclined surfaces 160 are inclined toward the direction of the second installation inclined surface 120, Figure 2 As shown, the length direction of the leaf spring base 100 is the X direction in the figure. In this embodiment, the leaf spring base 100 is provided with four inclined surfaces 160, which are respectively arranged on both sides of the leaf spring base 100 along the X direction. The depth of the inclined surface 160 along the plumb direction of the first mounting surface 110 is 3 mm to 5 mm, that is, along Figure 2In the Y direction shown, the depth of the inclined surface 160 is 3mm to 5mm. This design is mainly because the bounce of the leaf spring 300 is generally 3mm to 5mm, which can play a buffering role against the bounce of the leaf spring 300. In one embodiment, the first mounting surface 110 is provided with a first blind hole 111, and the depth of the first blind hole 111 ranges from 12mm to 16mm. The first blind hole 111 is arranged in the middle position of the first mounting surface 110, which can realize accurate installation and positioning with the axle 200. Optionally, the first blind hole 111 has a depth range of 14mm and a diameter range of 18mm-22mm, which is used to realize the fixed installation of the leaf spring base 100 on the axle 200, while avoiding the problem of positioning slippage caused by the first blind hole 111 being too shallow.

[0051] In another embodiment, the second installation bevel 120 is provided with a second blind hole 121, and the depth of the second blind hole 121 ranges from 12 mm to 16 mm. The second blind hole 121 is provided in the middle of the second installation bevel 120, and can achieve precise installation and positioning with the leaf spring 300. Optionally, the second blind hole 121 has a depth range of 14 mm and a diameter range of 18 mm to 22 mm, which avoids the problem of positioning slipping caused by the second blind hole 121 being too shallow. Further, the first installation surface 110 and the second installation bevel 120 of this embodiment are both provided with blind holes, so that the leaf spring base 100 can be accurately located between the leaf spring 300 and the axle 200.

[0052] In one embodiment, the leaf spring base 100 is provided with a through hole 170 for connecting the axle 200 and the leaf spring 300 through a connecting member (not marked in the figure). There are four through holes 170, which are arranged in a square shape, wherein the distance between two adjacent through holes 170 along the length direction of the leaf spring base 100 is 70 mm to 90 mm, and the distance between two adjacent through holes 170 along the width direction of the leaf spring base is 30 mm to 50 mm. The connecting member may be a U-shaped bolt, and the U-shaped bolt passes through the four through holes 170 to realize the fixed installation of the leaf spring base 100 between the axle 200 and the leaf spring 300. The above structure can not only reduce the weight of the leaf spring base 100, but also ensure the balance of the structure due to the symmetrical structural design, wherein the length direction of the leaf spring base is the X direction, and the width direction of the leaf spring base is the Z direction.

[0053] Based on the leaf spring base 100 in the above embodiment, a CAE analysis test is performed, including analyzing the static strength, dynamic strength, and torsional performance of the leaf spring base 100 .

[0054] Table 2: Simulated performance evaluation values ​​of polyamide leaf spring base

[0055]

[0056] The values ​​of the specific test and analysis results are shown in Table 2. ① From the static strength stress analysis, the leaf spring base 100 is replaced from the traditional ductile iron QT450 to the high-strength polyamide material. The force during operation is about 40000N. Therefore, the static pressure simulation of the component is carried out with this force. The main structural strength is only 5.18MPa, which is much less than the tensile strength of the high-strength polyamide material of 130MPa. ② From the dynamic strength analysis, a 2.5 times dynamic load coefficient is applied to the leaf spring base using high-strength polyamide, and a load of 100000N is applied. ③ From the analysis of torque working conditions, the U-bolt matching the leaf spring base is M22, and the preload force of the U-bolt is set to 500Nm. The force loaded on the lower base is calculated to be 73.61MPa, which is also less than the tensile strength of high-strength polyamide. In general, the leaf spring base 100 made of high-strength polyamide meets the product design requirements in terms of static strength, dynamic strength and torsional performance.

[0057] refer to Figure 4 and Figure 5 The second aspect of the embodiment of the present application provides a leaf spring suspension system (not marked), which is an important component of the vehicle, and is mainly composed of a leaf spring 300, an upper cover plate, a U-bolt and the above-mentioned leaf spring base 100, etc., and is used to connect the vehicle frame 410 and the axle 200. Specifically, the above-mentioned leaf spring suspension system is installed between the vehicle frame 410 and the axle 200, and is used to transmit the force and torque between the axle 200 and the frame 410. It can not only play the role of force transmission and guidance, but also has the function of buffering and vibration reduction, so as to achieve the purpose of vehicle driving smoothness and handling stability. It is generally suitable for vehicles such as semi-trailers, trailers, and cargo trucks.

[0058] In the above leaf spring suspension system, a leaf spring base 100 made of polyamide material is used, which not only realizes the lightweight of the leaf spring suspension system, but also realizes the lightweight and cost reduction of the product by optimizing the structure design of the leaf spring base 100. For the improved leaf spring suspension system, in order to better reflect the rationality of the structural design, the leaf spring base is fixed between the leaf spring 300 and the axle 200 by U-bolts, and the CAE analysis test of the leaf spring suspension system assembly performance is further carried out, including the simulation performance evaluation of the leaf spring suspension system. The values ​​of the specific test analysis results are shown in Table 3 below, among which the synchronous beating mode of the front suspension is 13.5Hz, and the asynchronous beating mode is 11.9Hz, both of which meet the design requirements of the vehicle product.

[0059] Table 3: Leaf spring suspension system simulation performance evaluation values

[0060]

[0061] On the other hand, reference Figure 5 The third aspect of the embodiment of the present application provides a vehicle 400, including the above-mentioned leaf spring suspension system and a frame 410, wherein the leaf spring suspension system is installed on the lower side of the frame 410. In combination with the analysis and testing of product performance, as well as lightweight and cost analysis, the leaf spring base 100 with optimized structure fully meets the design requirements of the vehicle leaf spring base in various performance indicators on the basis of adopting high-strength polyamide material, achieves the goals of lightweight and cost reduction, and can be widely used in vehicles with current leaf spring suspension systems.

[0062] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0063] It should be noted that the embodiments indicated by "in specific implementation", "in some embodiments", "in this embodiment", "exemplarily" and the like mentioned in the specification may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0064] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a" or "" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0065] It should be readily understood that the phrase "in . . . " in this disclosure should be interpreted in the broadest manner.

[0066] The present invention further includes the following: "on", "above", and "over", so that "on" not only means "directly on something", but also includes the meaning of "on something" with intervening features or layers therebetween, and "above" or "over" not only includes the meaning of "above" or "over", but also includes the meaning of "above" or "over" with no intervening features or layers therebetween (i.e., directly on something).

[0067] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A leaf spring base, used for installation between a vehicle axle and a leaf spring, characterized in that: The leaf spring base is made of polyamide and includes: A first mounting surface, used to be arranged on a side of the leaf spring base facing the axle; The second installation bevel is used to be arranged on the side of the leaf spring base facing the leaf spring, and the end where the first installation surface and the second installation bevel are close to each other forms a thin end of the leaf spring base, and the thin end is arranged towards the direction of the vehicle's movement.

2. The leaf spring base according to claim 1, characterized in that: The included angle between the first mounting surface and the second mounting inclined surface is in the range of 2° to 4°.

3. The leaf spring base according to claim 1, characterized in that: The leaf spring base is provided with a fillet at a circumferential edge along the plumb direction of the first mounting surface, and the radius of the fillet is 3° to 5°.

4. The leaf spring base according to claim 1, characterized in that: The second installation inclined surface is provided with inclined surfaces on both sides along the length direction of the leaf spring base, the inclined surfaces are close to the edge of the leaf spring base in the length direction and are inclined toward the direction of the first installation surface, and / or, Inclined surfaces are arranged on both sides of the first mounting surface along the length direction of the leaf spring base. The inclined surfaces are close to the edges of the leaf spring base in the length direction and are inclined toward the direction of the second mounting inclined surface.

5. The leaf spring base according to claim 4, characterized in that: The depth of the inclined surface along the plumb direction of the first mounting surface is 3 mm to 5 mm.

6. The leaf spring base according to claim 1, characterized in that: The first mounting surface is provided with a first blind hole, and the depth of the first blind hole ranges from 12 mm to 16 mm.

7. The leaf spring base according to claim 1, characterized in that: The second installation inclined surface is provided with a second blind hole, and the depth of the second blind hole ranges from 12 mm to 16 mm.

8. The leaf spring base according to claim 1, characterized in that: The leaf spring base is penetrated by a through hole for connecting the axle and the leaf spring via a connecting piece.

9. The leaf spring base according to claim 8, characterized in that: There are four through holes arranged in a square shape, wherein the distance between two adjacent through holes along the length direction of the leaf spring base is 70 mm to 90 mm, and the distance between two adjacent through holes along the width direction of the leaf spring base is 30 mm to 50 mm.

10. The leaf spring base according to any one of claims 1 to 9, characterized in that: The materials of the polyamide include: caprolactam, sodium methoxide, sodium hydroxide, isocyanate, ultrafine molybdenum disulfide powder, hollow glass microspheres and talcum powder. The weight of the caprolactam accounts for 90% to 92% of the weight of the polyamide, the weight of the sodium methoxide accounts for 2% to 4% of the weight of the polyamide, the weight of the sodium hydroxide accounts for 1.5% to 2% of the weight of the polyamide, the weight of the isocyanate accounts for 3% to 3.5% of the weight of the polyamide, the weight of the ultrafine molybdenum disulfide powder accounts for 0.2% to 0.5% of the weight of the polyamide, and the sum of the weights of the hollow glass microspheres and the talcum powder accounts for 0.5% to 0.8% of the weight of the polyamide.

11. A leaf spring suspension system, characterized in that: The leaf spring suspension system comprises the leaf spring base as described in any one of claims 1 to 10, and the leaf spring base is arranged between the leaf spring and the axle.

12. A vehicle, characterized in that: The vehicle comprises the leaf spring suspension system as claimed in claim 11, wherein the vehicle further comprises a chassis system, and the leaf spring suspension system is mounted on the chassis system.

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