CN220639431U

CN220639431U - Leaf spring body, mould and leaf spring assembly for preparing leaf spring body

Info

Publication number: CN220639431U
Application number: CN202321848101.5U
Authority: CN
Inventors: 董轩诚
Original assignee: Xi'an Lianrui Technology Industry Co ltd
Current assignee: Xi'an Lianrui Technology Industry Co ltd
Priority date: 2023-07-14
Filing date: 2023-07-14
Publication date: 2024-03-22
Anticipated expiration: 2033-07-14

Abstract

The application provides a leaf spring body, a die for preparing the leaf spring body and a leaf spring assembly, wherein the leaf spring body is provided with a parabolic structure, the convex surface of the parabolic structure is the upper surface of the leaf spring body, and the concave surface of the parabolic structure is the lower surface of the leaf spring body; a step structure is formed between the side surface and the upper surface of the parabolic structure; the step structure comprises a first vertical surface vertical to the upper surface and a first plane vertical to the first vertical surface, and a first connection surface is formed between the upper surface and the first vertical surface. In this application embodiment, this step structure and first design of linking the surface can promote the mechanical properties of leaf spring body on the basis of the research and development cost and the manufacturing cost that reduce the mould that is used for preparing the leaf spring body.

Description

Leaf spring body, mould and leaf spring assembly for preparing leaf spring body

Technical Field

The present application relates to suspensions for automobiles, and more particularly, to a leaf spring body, a mold for preparing the leaf spring body, and a leaf spring assembly.

Background

With the increasing consumption of fossil energy and the increasing emphasis on environmental problems worldwide, the speed of innovation of new materials and technologies in the automotive industry is increasing. The automobile is light, so that the consumption of fossil energy by people can be greatly reduced, the cargo carrying capacity of the automobile can be improved, and the service efficiency of the automobile is improved. Besides the characteristics of light weight and high strength, the composite material also has better shock absorption and fatigue life, so that the composite material is widely applied in the field of automobiles.

The composite material is widely studied by a plurality of automobile manufacturers in recent years as a plate spring material for automobiles, and is commercially applied to part of automobile types. The molding process of the composite plate spring is generally classified into a continuous Filament Winding (Filament Winding) process and a die pressing (Compressing Molding) process.

The composite plate spring developed by most manufacturers adopts a die pressing process, the precision is high relative to that of a fiber winding process, the surface is smooth after the product is molded, and secondary processing is not needed. Resin transfer molding (Resin Transfer Molding, RTM) is a typical molding process, specifically, placing preformed fiber-reinforced material in a mold cavity, the mold being sealed and secured at the periphery and ensuring smooth resin flow inside; and (3) injecting quantitative resin after sealing the mould, and demoulding after the resin is solidified to obtain a desired product.

However, for the molding process, since the preformed reinforcing fiber material needs to be impregnated by the injected resin flowing in the sealed mold after the mold is sealed, if the resin does not flow smoothly, the performance of the plate spring body is affected. In general, a structure for facilitating the resin flow needs to be specially designed in the mold, but the equipment development cost of the mold is excessively high, which increases the manufacturing cost of the plate spring body.

Therefore, how to improve the mechanical properties of the leaf spring body on the basis of reducing the development cost and the manufacturing cost of the mold for manufacturing the leaf spring body is a technical problem to be solved in the art.

Disclosure of Invention

The application provides a leaf spring body, mould and leaf spring assembly for preparing the leaf spring body, can promote the mechanical properties of leaf spring body on the basis of the research and development cost and the manufacturing cost that reduce the mould that is used for preparing the leaf spring body.

In a first aspect, the present application provides a leaf spring body having a parabolic structure with a convex surface being an upper surface of the leaf spring body and a concave surface being a lower surface of the leaf spring body; a step structure is formed between the side surface and the upper surface of the parabolic structure; the step structure comprises a first vertical surface perpendicular to the upper surface and a first plane perpendicular to the first vertical surface, and a first connection surface is formed between the upper surface and the first vertical surface.

In a second aspect, the present application provides a mold for preparing a leaf spring body, comprising: an upper die and a lower die; wherein the upper and lower molds are formed with cavities after fastening, the shape of the cavities being the same as the shape of the plate spring body provided according to the first aspect.

In a third aspect, there is provided a leaf spring assembly comprising:

according to the plate spring body provided by the first aspect, two ends of the plate spring body are nested on the plate spring seat, the plate spring seat is fixedly connected with the vehicle frame, and the middle part of the plate spring body is fixed on the vehicle axle through the U-shaped bolt;

in a fourth aspect, there is provided a leaf spring assembly comprising:

according to the plate spring body provided by the first aspect, the metal rolling lugs are fixedly arranged at the two ends of the plate spring body and fixedly connected with the vehicle frame, and the middle part of the plate spring body is fixed on the vehicle axle through the U-shaped bolts.

With respect to the plate spring body provided in the first aspect, in one aspect, a stepped structure is formed between a side surface and an upper surface of the plate spring body; wherein the step structure includes a first vertical surface perpendicular to the upper surface of the leaf spring body and a first plane perpendicular to the first vertical surface; on the other hand, form first linking surface between the upper surface of this leaf spring body and this first vertical face, the design of this step structure and first linking surface can promote the mechanical properties of leaf spring body on the basis of reducing the research and development cost and the manufacturing cost of the mould that is used for preparing the leaf spring body.

Wherein the design analysis for the step structure and the first engagement surface is as follows:

on the one hand, due to the fact that the step structure is introduced, the width of the upper surface of the plate spring body is smaller than that of the lower surface of the plate spring body, namely, the width of the upper surface of the plate spring body and the width of the first plane are equal to that of the lower surface of the plate spring body, fastening difficulty and sealing difficulty between an upper die and a lower die can be reduced, and research and development cost and manufacturing cost of a die for manufacturing the plate spring body are further reduced.

Moreover, because the region of structure emergence mutation in the leaf spring body is the region of concentrated atress generally, through introducing this step structure, can change the structure between the upper surface of leaf spring body and the side surface of leaf spring body into this step structure by the perpendicular structure that forms when directly crossing, slowed down the range of structure mutation, and then can reduce because the upper surface atress of this leaf spring body is too concentrated and lead to the cracked probability of leaf spring body, and then can promote the mechanical properties of this leaf spring body.

On the other hand, on the basis of introducing this step structure, through the first linking surface of design between the upper surface of this leaf spring body and this first vertical face, can make the upper surface smooth transition of this leaf spring body to this first vertical face, guaranteed that the structure of this leaf spring body is streamline structure, avoided the structure that helps the resin to flow of special design in the mould, reduced the research and development cost and the manufacturing cost of the mould that is used for preparing the leaf spring body.

Moreover, through the first linking surface of design between the upper surface of this leaf spring body and this first vertical face, can guarantee that the resin material can smooth and easy flow in the mould after the sealing, avoided because the resin material flows unsmooth problem that leads to the resin material uneven distribution and forms the bubble between the resin material, promoted the mechanical properties of leaf spring body.

To sum up, in this embodiment, whether a step structure is introduced between the upper surface of the leaf spring body and the side surface of the leaf spring body, or a first engagement surface is introduced between the upper surface of the leaf spring body and the first vertical surface, the mechanical properties of the leaf spring body can be improved on the basis of reducing the development cost and the manufacturing cost of the mold for preparing the leaf spring body.

Drawings

Fig. 1 is a schematic side view of a leaf spring body provided herein.

Fig. 2 is a schematic side view of a leaf spring assembly provided herein.

Fig. 3 is an example of a perspective view of a leaf spring body provided herein.

Fig. 4 is an example of a perspective view and a corresponding enlarged end view of a leaf spring body provided herein.

Fig. 5 is an example of a cross-sectional view of a flat spring body provided herein without cutting burrs or flashes, taken perpendicular to the length direction.

Fig. 6 is an example of a cross-sectional view of a cut burr or flash leaf spring body provided herein in a direction perpendicular to the length direction.

Fig. 7 is another example of a cross-sectional view of a cut burr or flash leaf spring body provided herein taken perpendicular to the length direction.

Detailed Description

It is noted that those skilled in the art will appreciate that the examples referred to below are only illustrative of the solutions provided by the present application and should not be construed as limiting the scope of the present application. For example, the examples are not to be construed as specifying a particular technique or condition, as described in the literature in the field, or as per the product specifications. As another example, the reagents or apparatus used in connection with the present application may be conventional products available commercially without the manufacturer's attention. In addition, for convenience of explanation, the same reference numerals denote the same components with respect to the related drawings referred to in the present application, and detailed explanation of the same components is omitted in different embodiments for brevity.

In order to facilitate the understanding of the solution according to the present application, the concept according to which the body of the composite leaf spring is concerned will be described below.

Composite material: refers to a material which is formed by compounding two or more materials when the material can not meet the use requirement and can meet the requirement of people.

By way of example, glass fibers, while strong, are loose between fibers, can only withstand tensile forces, cannot withstand bending, shearing and compressive stresses, and are not easily formed into a fixed geometry, and are loose. If glass fibers are bonded together with synthetic resin, a glass fiber reinforced plastic matrix composite can be formed that can be formed into a variety of rigid articles having a fixed shape that can withstand both tensile and bending, compressive and shear stresses. Since the glass fiber reinforced plastic-based composite material has strength equivalent to steel, contains glass components, and also has properties such as color, shape, corrosion resistance, electrical insulation, heat insulation, and the like, which may also be referred to as "glass fiber reinforced plastic".

The composite material consists of a reinforcing material and a matrix material. For example, for reinforced concrete composites, the concrete is the matrix and the reinforcement is the reinforcing material.

Wherein the matrix material includes, but is not limited to, epoxy resin, polyester resin, thermoplastic resin, etc. For example, the matrix material may be a resin matrix, i.e. a matrix of a resin-based composite material. The resin matrix refers to a glue solution system composed of resin and a curing agent. As an example, the resin matrix may include a thermosetting resin and a thermoplastic resin. Thermosetting resins can only be heated and molded once, and cure during processing to form insoluble network crosslinked polymer compounds, and therefore cannot be regenerated. The resin matrix of the composite material is mainly thermosetting resin. Thermoset resins include, but are not limited to: phenolic resins, urea-formaldehyde resins, melamine-formaldehyde resins, epoxy resins, unsaturated resins, polyurethanes, polyimides, and the like. Reinforcing materials include, but are not limited to, carbon fibers, glass fibers, aramid fibers, and the like.

Reinforcing materials include, but are not limited to, carbon fibers, glass fibers, aramid fibers, and the like. The reinforcing material may be reinforcing fibers (reinforcing fibers), i.e., a reinforcement of a resin-based composite material. By way of example, the reinforcing material comprises, geometrically: particulate, one-dimensional fibrous, two-dimensional lamellar (e.g., felt), and three-dimensional steric structures. Inorganic reinforcing materials and organic reinforcing materials are classified by properties, and may be synthetic or natural. The inorganic reinforcing material may be fibrous, such as inorganic glass fibers, carbon fibers, and ceramic fibers such as a small amount of silicon carbide, and the organic reinforcing material includes aramid fibers (aramid fibers) and the like.

As an example, the reinforcing material of the composite plate spring body according to the present application may be glass fibers, carbon fibers, or a fiber bundle composed of glass fibers and carbon fibers, and the matrix material may be a material such as epoxy resin, or may be referred to as a fiber-reinforced plastic (FRP) plate spring body.

Compared with the metal plate spring body, the composite plate spring body has the advantages of high strength, good temperature resistance, good impact resistance, strong designability, weight reduction of more than 70%, safe fracture and the like, so that the smoothness and the comfort of a vehicle can be greatly improved by using the composite plate spring body, the quality is only about 1/4 of that of the plate spring body, the fuel efficiency is effectively improved, the service life of the plate spring body is prolonged, namely, the plate spring body does not need to be replaced in the service life of the whole vehicle, and the use cost and the maintenance cost of the whole vehicle are relatively low.

The installation of the composite plate spring body is similar to the installation of the plate spring, and the middle part needs to be fixed on the axle like the plate spring, and the two ends are connected on the vehicle body.

Fig. 1 is a schematic structural view of a leaf spring body 100 provided in the present application.

As shown in fig. 1, the plate spring body 100 has a parabolic structure, the convex surface of the plate spring body 100 is an upper surface 111 of the plate spring body 100, the concave surface of the plate spring body 100 is a lower surface 112 of the plate spring body 100, and a side surface of the plate spring body 100 is formed between the upper surface 111 and the lower surface 112. The leaf spring body 100 can be arranged longitudinally or transversely on the vehicle, which can be provided with additional guiding (force transmission) means, because of the longitudinal force to be transmitted.

Fig. 2 is a schematic side view of a leaf spring assembly provided herein.

As shown in fig. 2, the leaf spring assembly includes a leaf spring body 100, the middle portion of which leaf spring body 100 can be secured to a coupler 260 of an axle 250 by two U-bolts and nuts (e.g., U-bolt 230 and the nut of U-bolt 230 shown in the figures). The ends of the leaf spring body 100 may be nested within the spring mounts (the spring mount 210 and the spring mount 220 as shown) that are secured to the frame. Of course, in another implementation, the two ends of the plate spring body 100 may also be fixedly provided with metal rolling lugs fixedly connected with the frame, and the middle part of the plate spring body is fixed on the axle through a U-shaped bolt.

The molding process of the composite plate spring is generally classified into a continuous Filament Winding (Filament Winding) process and a die pressing (Compressing Molding) process.

The filament winding process may wind the resin-impregnated filament on a mold having a fixed shape and then cure the same to obtain a molded product. However, the strength of the filament winding process is greatly affected by the bonding degree between filaments, and the phenomena of weak interlayer bonding force, easiness in splitting and the like exist, so that the fatigue resistance and strength of the product are lower, and the performance requirement of the plate spring cannot be well met. Therefore, the composite plate spring developed by most manufacturers adopts a die pressing process, the precision is high relative to that of a fiber winding process, the surface of the product is smooth after the product is molded, and secondary processing is not needed. Resin transfer molding (Resin Transfer Molding, RTM) is a typical molding process. Specifically, a preformed fiber reinforced material is paved in a die cavity, the die is required to be sealed and fastened at the periphery, and the resin can flow smoothly inside; and injecting quantitative resin after the mold is closed, and demolding after the resin is solidified to obtain the expected composite plate spring body.

However, for the molding process, since the preformed reinforcing fiber material needs to be impregnated by the injected resin flowing in the sealed mold after the mold is sealed, if the resin does not flow smoothly, the performance of the plate spring body is affected. In general, a structure for facilitating resin flow needs to be specially involved in the mold, but the equipment development cost of the mold is excessively high, which increases the manufacturing cost of the leaf spring body.

In view of this, this application provides a leaf spring body, mould and leaf spring assembly for preparing leaf spring body, carries out streamline design through the structure to the leaf spring body to guarantee that the resin material can smooth and easy flow in the mould after sealed, and then can promote the mechanical properties of leaf spring body on the basis of the cost of preparation that reduces the leaf spring body.

The leaf spring body provided in the present application is described in detail below.

In some embodiments, the leaf spring body has a parabolic structure with a convex surface being an upper surface of the leaf spring body and a concave surface being a lower surface of the leaf spring body; a step structure is formed between the side surface and the upper surface of the parabolic structure; the step structure comprises a first vertical surface perpendicular to the upper surface and a first plane perpendicular to the first vertical surface, and a first connection surface is formed between the upper surface and the first vertical surface.

Illustratively, the thickness of the leaf spring body is greatest and the width thereof is smallest at an intermediate position, the thickness of the leaf spring body is smallest and the width thereof is greatest at both ends of the leaf spring body, a transition region exists between the intermediate position and either one of the ends, the thickness of the leaf spring body in the transition region gradually decreases in a direction from the intermediate position to the either one of the ends, and the width of the leaf spring body in the transition region gradually increases in a direction from the intermediate position to the either one of the ends.

Because the plate spring body is in the middle part of plate spring body in the in-service use, the biggest position of this plate spring body bearing pressure is consequently, and the thickness of this plate spring body in intermediate position department is biggest and width is minimum to and this plate spring body is when the thickness of this plate spring body in the both ends department is minimum and width is biggest, can promote the extreme value of the pressure that the plate spring body (i.e. the middle part of this plate spring body) bears, and then promotes the mechanical properties of plate spring body. In addition, through introducing this transition region, can avoid this leaf spring body to appear the concentrated abrupt change structure of atress, the effort that reduces this leaf spring body in this transition region department as far as, and then can promote the mechanical properties of leaf spring body.

Illustratively, the first engagement surface may be a beveled, curved or wave-shaped surface or the like.

In this embodiment, with respect to the plate spring body provided in the first aspect, in one aspect, a stepped structure is formed between a side surface and an upper surface of the plate spring body; wherein the step structure includes a first vertical surface perpendicular to the upper surface of the leaf spring body and a first plane perpendicular to the first vertical surface; on the other hand, form first linking surface between the upper surface of this leaf spring body and this first vertical face, the design of this step structure and first linking surface can promote the mechanical properties of leaf spring body on the basis of reducing the research and development cost and the manufacturing cost of the mould that is used for preparing the leaf spring body.

In some embodiments, a cutting structure is formed between the first plane and the side surface, and the cutting structure is a structure formed by cutting burrs or flash of the plate spring body.

In other words, in the preparation of the leaf spring body, burrs or flashes of the leaf spring body only occur in the region between the first plane and the side surfaces of the leaf spring body, or in other words, in the region between the first plane and the side surfaces of the leaf spring body at the sealing positions of the upper and lower molds for preparing the leaf spring body.

In this embodiment, since the position between the first plane and the side surface of the leaf spring body is the area where the stress concentration is weakest in the step structure, the cutting structure is designed in the area between the first plane and the side surface, which is convenient for cutting the flash or burr of the leaf spring body, and can avoid the problem that the mechanical property of the leaf spring body is reduced due to the breakage of the reinforcing material when cutting the burr or burr of the leaf spring body in the area where the stress concentration is strong, thereby improving the mechanical property of the leaf spring body.

Moreover, the cutting structure is designed in the area between the first plane and the side surface, so that the upper surface of the plate spring body, the first connecting surface and the step structure can be integrally formed through an upper die, the forming difficulty of the step structure and the first connecting surface is reduced, and the integrity and the mechanical property of the step structure and the first connecting surface can be ensured.

Illustratively, the cutting structure is a raised structure.

For example, when cutting burrs or flashes of the leaf spring body, if a portion of the burrs or flashes remain, a protruding structure can be formed between the first plane and the side surface, which protruding structure can ensure that the reinforcing material in the leaf spring body is not cut off when cutting the burrs or flashes of the leaf spring body on the basis of not affecting the mounting of the leaf spring body, thereby ensuring the integrity and mechanical properties of the leaf spring body.

Illustratively, the cutting structure is a cutting surface.

For example, the cutting surface may be a planar, beveled, curved or wave-shaped surface, or the like.

For example, where the cutting surface is planar, the cutting surface may be a surface parallel to the first plane. When the cutting surface is a bevel, the cutting surface may be a surface forming a predetermined angle with the first plane. The value range of the preset angle is 1-99 degrees.

Of course, in other alternative embodiments, the cutting structure may be formed at a position where stress concentration is weak, such as a middle position of the first plane in the width direction or a center position of the side surface, so as to ensure mechanical properties of the leaf spring body, which is not limited in this application.

In some embodiments, the length of a first line segment formed by the intersection of the first vertical surface and a cross section perpendicular to the length direction of the leaf spring body is less than or equal to 2/3 of the length of a second line segment formed by the intersection of the side surface and the cross section.

For example, the cross section perpendicular to the length direction of the plate spring body may be a cross section perpendicular to the upper surface of the plate spring body, or the cross section perpendicular to the length direction of the plate spring body may be a cross section perpendicular to the lower surface of the plate spring body, or the cross section perpendicular to the length direction of the plate spring body may be a cross section perpendicular to the side surface of the plate spring body.

Illustratively, an upper half portion of the leaf spring body corresponding to the first line segment is shaped by an upper die, and a lower plate portion of the leaf spring body corresponding to the second line segment is shaped in the lower die, wherein a length of a first line segment formed by the first vertical surface intersecting a cross section perpendicular to a length direction of the leaf spring body is less than or equal to 2/3 of a length of a second line segment formed by the side surface intersecting the cross section. Wherein the upper die and the lower die are used for preparing the plate spring body. For example, the upper and lower molds are fastened to form a cavity that mates with the leaf spring body, the cavity being used to shape the leaf spring body.

In this embodiment, since the width of the upper surface of the plate spring body is smaller than the width of the lower surface due to the introduction of the step structure, on the basis of designing the length of the first line segment to be smaller than 2/3 of the length of the second line segment, it is possible to ensure that the thickness of the lower half portion of the plate spring body is greater than the thickness of the upper half portion. Since the portion to be shaped in the lower mold is usually the lower half of the plate spring body during the preparation of the plate spring body, the impregnation time of the lower half is the longest and the impregnation degree is the strongest. Therefore, when the thickness of the lower half part of the plate spring body is designed to be larger than that of the upper half part, the resin material can be used for impregnating the reinforcing fiber material of the plate spring body for the longest time and the strongest degree, and the mechanical property of the plate spring body can be improved.

In addition, because the leaf spring body is parabolic structure and convex surface is the upper surface, consequently, in the in-process of using this leaf spring body, the stress that receives in the latter half of this leaf spring body is usually bigger than the stress that receives in the latter half of this leaf spring body, on this basis, designs the length of this first line segment to be less than the length of this second line segment 2/3, has avoided leading to the problem that the stress concentration range increases to appear in the latter half of this leaf spring body owing to the introduction of this step structure, and then can promote the mechanical properties of leaf spring body.

Of course, in other alternative embodiments, the length of the first line segment may be less than or equal to other multiples of the length of the second line segment, for example, the length of the first line segment may be less than or equal to 1/3 of the length of the second line segment, or even the length of the first line segment may be greater than other multiples of the length of the second line segment, so long as the first defined length is ensured to be less than the second line segment, that is, the mechanical property of the leaf spring body is ensured.

It should be noted that, in other alternative embodiments, if the portion of the leaf spring body corresponding to the first line segment needs to be shaped by a lower mold, and the portion of the leaf spring body corresponding to the second line segment may be shaped in an upper mold, the length of the first line segment may be greater than the length of the second line segment, which is not limited in this application.

In some embodiments, the range of values of the length of the first line segment is: 0.5 mm-50 mm.

In this embodiment, the lower limit of the value range of the length of the first line segment is designed to be 0.5mm, so that the step structure is ensured to have a clear outline, the design requirement of the plate spring body on the upper die is reduced, and the preparation complexity of the upper die can be further reduced. In addition, the upper limit of the value range of the length of the first line segment is designed to be 50mm, so that the dimension of the first vertical surface is prevented from being too large, the thickness of the lower half part of the plate spring body is ensured to be larger than that of the upper half part, namely, the resin material can impregnate the reinforcing fiber material of the plate spring body to the maximum time and the strongest degree, and the mechanical property of the plate spring body can be improved; the problem that the stress concentration amplitude is increased in the upper half part of the plate spring body due to the oversized step structure can be avoided, and the mechanical property of the plate spring body can be improved.

Of course, in other alternative embodiments, the range of values of the first line segment may be other ranges, which is not specifically limited in this application.

In some embodiments, the range of values of the length of the second line segment is: 10 mm-200 mm.

In this embodiment, the range of the length of the second line segment is designed to be 10 mm-200 mm, and compared with the range of the length of the first line segment is designed to be 2 mm-50 mm, the thickness of the lower half part of the leaf spring body can be ensured to be larger than that of the upper half part, namely, the resin material can be used for impregnating the reinforcing fiber material of the majority of the leaf spring body for the longest time and the strongest degree, so that the mechanical property of the leaf spring body can be improved.

Of course, in other alternative embodiments, the range of values of the second line segment may be other ranges, which is not specifically limited in this application.

In some embodiments, the length of the line segment formed by the intersection of the first plane and the cross section perpendicular to the length direction of the leaf spring body is in the range of: 0.2 mm-10 mm.

In this embodiment, the lower limit of the value range of the length of the line segment formed by intersecting the first plane with the cross section perpendicular to the length direction of the plate spring body is designed to be 0.2mm, so that the step structure has a clear enough outline, the design requirement of the plate spring body on the upper die is reduced, and the preparation complexity of the upper die can be further reduced.

Moreover, the upper limit of the value range of the length of the line segment formed by the intersection of the first plane and the cross section perpendicular to the length direction of the plate spring body is designed to be 10mm, so that the problem that the stress concentration amplitude is increased in the upper half part of the plate spring body due to the oversized step structure can be avoided, and the mechanical property of the plate spring body can be improved.

In some embodiments, when the first engagement surface is a transitional cambered surface, the radius of an arc formed by intersecting the first engagement surface with a cross section perpendicular to the length direction of the leaf spring body is in the range of: 2 mm-20 mm.

In this embodiment, design this first linking surface as the transition cambered surface, can make the upper surface of this leaf spring body as far as smooth transition to this first vertical face, the structure that has guaranteed this leaf spring body at the maximum promptly is streamline structure, has avoided the structure that is favorable to the resin flow of special design in the mould, has reduced the research and development cost and the manufacturing cost of the mould that is used for preparing the leaf spring body.

Moreover, the first connection surface is designed into a transitional cambered surface, so that smooth flow of the resin material in the sealed die can be ensured, the problems of uneven distribution of the resin material and bubble formation among the resin materials caused by unsmooth flow of the resin material are avoided, and the mechanical property of the plate spring body is improved.

In addition, the lower limit of the value range of the radius of the arc formed by intersecting the first connecting surface with the cross section perpendicular to the length direction of the plate spring body is designed to be 2mm, so that the undersize of the first connecting surface is avoided, the first connecting surface can be ensured to have a clear enough outline, the design requirement of the plate spring body on an upper die is reduced, the preparation complexity of the upper die can be further reduced, the effect that the first connecting surface can smoothly transition the upper surface of the plate spring body to the first vertical surface can be ensured, and the mechanical property of the plate spring body is improved.

Moreover, the upper limit of the value range of the radius of the arc formed by the intersection of the first connecting surface and the cross section perpendicular to the length direction of the plate spring body is designed to be 20mm, so that the problem that the stress concentration amplitude is increased in the upper half part of the plate spring body due to the oversized first connecting surface is avoided, and the mechanical property of the plate spring body can be improved.

Of course, in other alternative embodiments, the radius of the arc formed by the intersection of the first engagement surface and the cross section perpendicular to the length direction of the leaf spring body may be other ranges, which are not particularly limited in this application.

In some embodiments, the first vertical plane and the first plane intersect perpendicularly.

In this embodiment, when crossing perpendicularly between this first vertical face and this first plane, reduced the design requirement of this leaf spring body to last mould, and then can reduce the preparation complexity of last mould.

In some embodiments, a second engagement surface is formed between the first vertical surface and the first plane.

Illustratively, the second engagement surface may be a beveled, curved or wave-shaped surface or the like.

In this embodiment, on the basis of introducing the step structure, through designing the second engagement surface between the first vertical surface and the first plane, the first vertical surface can be smoothly transitioned to the first plane, the structure of the leaf spring body is ensured to be a streamline structure, the structure which is specially designed in the mold and is conducive to resin flow is avoided, and the research and development cost and the manufacturing cost of the mold for preparing the leaf spring body are reduced.

In addition, through the design second linking surface between this first vertical face and this first plane, can also guarantee that the resin material can smooth and easy flow in the mould after the encapsulation, avoided because the resin material flows unsmooth problem that leads to the resin material uneven distribution and forms the bubble between the resin material, promoted the mechanical properties of leaf spring body.

In some embodiments, a second engagement surface is formed between the first vertical surface and the first plane, and a length of an intersection line of the first engagement surface and a cross section perpendicular to a length direction of the leaf spring body is greater than or equal to a length of an intersection line of the second engagement surface and the cross section.

Illustratively, the intersection of the first engagement surface with a cross-section perpendicular to the length direction of the leaf spring body may be: a line segment or arc formed by the intersection of the first engagement surface and the cross section.

Illustratively, the intersection of the second engagement surface with a cross-section perpendicular to the length direction of the leaf spring body may be: the second engagement surface intersects the cross section to form a line segment or arc.

In this embodiment, since the region where the shape of the leaf spring body is suddenly changed (i.e., the region where the first engagement surface and the second engagement surface are located) is often the region where the stress is most concentrated, the region protruding outward on the leaf spring body (i.e., the region where the first engagement surface is located) is generally subjected to a larger stress than the region recessed inward on the leaf spring body (i.e., the region where the second engagement surface is located). On the basis, the length of the intersection line of the first connecting surface and the cross section perpendicular to the length direction of the plate spring body is larger than or equal to that of the intersection line of the second connecting surface and the cross section, which is equivalent to the fact that the first connecting surface is designed to be smoother than the second connecting surface, the difference between the stress concentration intensity of the first connecting surface and the stress concentration intensity of the second connecting surface can be reduced, and then the mechanical property of the plate spring body can be improved.

Illustratively, the length of the intersection of the first engagement surface with the cross-section is determined from the length of the first line segment described above (i.e., the segment formed by the intersection of the first vertical plane with the cross-section). For example, the length of the intersection line of the first engagement surface and the cross section is proportional to the length of the first line segment, so as to reduce the difference between the stress concentration intensity of the first engagement surface and the stress concentration intensity of the step structure, and increase the mechanical property of the plate spring body.

Illustratively, the length of the intersection of the second engagement surface and the cross-section is determined by the length of a line segment formed by the intersection of the first plane and the cross-section. For example, the length of the intersection line of the second connecting surface and the cross section is proportional to the length of a line segment formed by the intersection of the first plane and the cross section, so as to reduce the difference between the stress concentration intensity of the second connecting surface and the stress concentration intensity of the step structure, and increase the mechanical property of the plate spring body.

Illustratively, when the first engagement surface and the second engagement surface are both transitional cambered surfaces, a radius of an arc formed by the intersection of the first engagement surface and a cross section perpendicular to the length direction of the leaf spring body is greater than or equal to a radius of an arc formed by the intersection of the second engagement surface and a cross section perpendicular to the length direction of the leaf spring body. When the first engagement surface and the second engagement surface are transitional cambered surfaces, the first engagement surface is tangent to the upper surface of the plate spring body and the first vertical surface respectively, and the second engagement surface is tangent to the first vertical surface and the first plane respectively.

The first engagement surface is a transitional cambered surface, and when the second engagement surface is a transitional inclined surface, the radius of an arc formed by the intersection of the first engagement surface and a cross section perpendicular to the length direction of the plate spring body is greater than or equal to the length of a line segment formed by the intersection of the second engagement surface and the cross section perpendicular to the length direction of the plate spring body. The first engagement surface is tangential to the upper surface of the leaf spring body and the first vertical surface, respectively.

The first engagement surface is a transition inclined surface, and when the second engagement surface is a transition cambered surface, the length of a line segment formed by the intersection of the first engagement surface and a cross section perpendicular to the length direction of the plate spring body is greater than or equal to the radius of an arc formed by the intersection of the second engagement surface and the cross section perpendicular to the length direction of the plate spring body. The second engagement surface is tangential to the first vertical surface and the first plane, respectively.

In an exemplary embodiment, when the first engagement surface and the second engagement surface are both transition slopes, a length of a line segment formed by the intersection of the first engagement surface and a cross section perpendicular to the length direction of the leaf spring body is greater than or equal to a length of a line segment formed by the intersection of the second engagement surface and a cross section perpendicular to the length direction of the leaf spring body.

Illustratively, when the first engagement surface and the second engagement surface are both transition slopes, the angle between the first engagement surface and the first plane is equal to the angle between the second engagement surface and the first plane. Therefore, the areas with stress concentration in the first connecting surface, the step structure and the second connecting surface can be avoided, and the mechanical property of the plate spring body is improved.

In some embodiments, when the second engagement surface is a transitional cambered surface, the radius of an arc formed by intersecting the second engagement surface and the cross section ranges from: 0.5 mm-5 mm.

In this embodiment, design this second linking surface as the transition cambered surface, can make this first vertical face smooth transition to this first plane as far as possible, the structure that has guaranteed this leaf spring body at the maximum promptly is streamline structure, has avoided the structure that specially designs in the mould and helps the resin to flow, has reduced the research and development cost and the manufacturing cost of the mould that is used for preparing the leaf spring body.

Moreover, the second connection surface is designed into a transitional cambered surface, so that smooth flow of the resin material in the sealed die can be ensured, the problems of uneven distribution of the resin material and bubble formation among the resin materials caused by unsmooth flow of the resin material are avoided, and the mechanical property of the plate spring body is improved.

In addition, the lower limit of the value range of the radius of the arc formed by intersecting the second connecting surface with the cross section perpendicular to the length direction of the plate spring body is designed to be 0.5mm, so that the undersize of the second connecting surface is avoided, the second connecting surface can be ensured to have a clear outline, the design requirement of the plate spring body on an upper die is reduced, the preparation complexity of the upper die can be further reduced, the effect that the second connecting surface can smoothly transition the first vertical surface to the first plane can be ensured, and the mechanical property of the plate spring body is improved.

Moreover, the upper limit of the value range of the radius of the arc formed by intersecting the second connecting surface with the cross section perpendicular to the length direction of the plate spring body is designed to be 5mm, so that the oversized second connecting surface is avoided, the step structure can be ensured to have a clear enough outline, the design requirement of the plate spring body on the upper die is reduced, and the preparation complexity of the upper die can be further reduced.

Of course, in other alternative embodiments, the radius of the arc formed by the intersection of the second engagement surface and the cross section perpendicular to the length direction of the leaf spring body may be other ranges, which are not particularly limited in this application.

In some embodiments, when the second engagement surface is a transition slope, the angle between the second engagement surface and the first plane ranges from 10 ° to 80 °

Illustratively, the angle between the second engagement surface and the first plane is in the range of 45 °.

In this embodiment, design the lower extreme of the range of the contained angle of this second linking surface and this first plane for 10, avoided this second linking surface and this first plane's contained angle too little, not only can guarantee that this second linking surface has enough clear profile, reduced the design requirement of this leaf spring body to last mould, and then can reduce the preparation complexity of last mould, can also guarantee that this second linking surface can play the effect of smoothly transitioning this first vertical face to this first plane, promoted the mechanical properties of leaf spring body.

Moreover, the upper limit of the value range of the included angle between the second connecting surface and the first plane is designed to be 80 degrees, so that the included angle between the second connecting surface and the first plane is prevented from being too large, the second connecting surface can be ensured to have a clear outline, the design requirement of the plate spring body on an upper die is reduced, the preparation complexity of the upper die can be further reduced, the second connecting surface can be ensured to play a role in smoothly transiting the first vertical surface to the first plane, and the mechanical property of the plate spring body can be improved.

In some embodiments, when the second engagement surface is a transition slope, the length of a line segment formed by intersecting the second engagement surface and the cross section ranges from: 0.5 mm-7 mm.

In this embodiment, the lower limit of the value range of the length of the line segment formed by intersecting the second linking surface with the cross section perpendicular to the length direction of the plate spring body is designed to be 0.5mm, so that the undersize of the second linking surface is avoided, the second linking surface can be ensured to have a clear enough outline, the design requirement of the plate spring body on the upper die is reduced, the preparation complexity of the upper die can be further reduced, the second linking surface can be ensured to smoothly transition the first vertical surface to the first plane, and the mechanical property of the plate spring body is improved.

And moreover, the upper limit of the value range of the length of the line segment formed by intersecting the second connecting surface with the cross section perpendicular to the length direction of the plate spring body is designed to be 7mm, so that the oversized second connecting surface is avoided, the step structure can be ensured to have a clear enough outline, the design requirement of the plate spring body on an upper die is reduced, and the preparation complexity of the upper die can be further reduced.

Of course, in other alternative embodiments, the range of the included angle between the second engagement surface and the first plane, and the range of the length (or the radius of the arc) of the line segment formed by the intersection of the second engagement surface and the cross section perpendicular to the length direction of the leaf spring body may also be other ranges, which are not limited in this application.

In some embodiments, a third engagement surface is formed between the side surface and the lower surface.

Illustratively, the third engagement surface may be a beveled, curved or wave-shaped surface or the like.

In some embodiments, the length of the intersection of the first engagement surface with a cross section perpendicular to the length direction of the leaf spring body is less than or equal to the length of the intersection of the third engagement surface with the cross section.

In this embodiment, since the plate spring body has a parabolic structure and the convex surface is an upper surface, in the use process, the stress received by the lower half portion of the plate spring body is generally greater than the stress received by the upper half portion of the plate spring body, on the basis, the length of the intersection line of the first engagement surface and the cross section perpendicular to the length direction of the plate spring body is smaller than or equal to the length of the intersection line of the third engagement surface and the cross section, which is equivalent to the design of the third engagement surface which is smoother than the first engagement surface, so that the difference between the stress concentration intensity of the first engagement surface and the stress concentration intensity of the third engagement surface can be reduced, and the mechanical property of the plate spring body can be improved.

Illustratively, the length of the intersection of the third engagement surface with the cross-section is determined from the length of the second line segment described above (i.e., the line segment formed by the intersection of the side surface of the leaf spring body with the cross-section). For example, the length of the intersection line of the third engagement surface and the cross section is proportional to the length of the second line segment, so as to reduce the stress concentration intensity of the third engagement surface and increase the mechanical property of the plate spring body.

The structure of the leaf spring body provided in the present application will be described below with reference to the accompanying drawings.

As shown in fig. 3, the plate spring body 100 has a parabolic structure, the convex surface of the plate spring body 100 is an upper surface 111 of the plate spring body 100, the concave surface of the plate spring body 100 is a lower surface 112 of the plate spring body 100, and a side surface of the plate spring body 100 is formed between the upper surface 111 and the lower surface 112. Further, the thickness of the plate spring body 100 at the intermediate position is maximum and the width thereof is minimum, the thickness of the plate spring body 100 at both ends of the plate spring body 100 is minimum and the width thereof is maximum, a transition region exists between the intermediate position and any one of the ends, the thickness of the plate spring body 100 at the transition region gradually decreases in the direction from the intermediate position to the any one of the ends, and the width of the plate spring body 100 at the transition region gradually increases in the direction from the intermediate position to the any one of the ends, so as to improve the mechanical properties of the plate spring body 100.

As shown in fig. 4, a stepped structure is formed between the side surface 125 of the plate spring body 100 and the upper surface 111 of the plate spring body 100.

Wherein the step structure comprises a first vertical face 121 perpendicular to the upper surface 111 and a first plane 122 perpendicular to the first vertical face 121. A first engagement surface 123 is formed between the upper surface 111 and the first vertical surface 121. A second engagement surface 124 is formed between the first vertical surface 121 and the first planar surface 122. A third engagement surface 126 is formed between the side surface 125 and the lower surface of the leaf spring body. As an example, the first engagement surface 123, the second engagement surface 124, and the third engagement surface 126 are all arcuate surfaces. The leaf spring body is formed with burrs or flashes 131 of the leaf spring body 100 between the first plane 122 and the side surface 125.

Fig. 5 is an example of a cross-sectional view 140 of the leaf spring body 100 shown in fig. 4.

As shown in fig. 5, the length of the first segment 1211 formed by the intersection of the first vertical surface 121 and the cross-section 140 is less than or equal to 2/3 of the length of the second segment 1251 formed by the intersection of the side surface 125 and the cross-section 140.

For example, the length of the first segment 1211 has a range of values: 0.5 mm-50 mm. The range of the length of the second line segment 1251 is: 10 mm-200 mm. The length of the line 1221 formed by intersecting the first plane 122 and the cross section 140 is in the range of: 0.2 mm-10 mm. The radius of the arc 1231 formed by the intersection of the first engagement surface 123 and the cross section 140 ranges from: 2 mm-20 mm. The radius of the arc 1241 formed by the intersection of the second engagement surface 124 and the cross section 140 ranges from: 0.5 mm-5 mm. The radius of the arc formed by the intersection of the third engagement surface 126 and the cross section 140 ranges from: 2 mm-20 mm.

As shown in fig. 6, a cutting device may form a cutting structure 1311 between the first plane 122 and the side surface 125 after cutting the burr or flash 131. The cutting structure 1311 may be a raised structure, i.e. a portion of the burr or flash 131 remains.

As shown in fig. 7, a cutting device may form a cutting structure 1311 between the first plane 122 and the side surface 125 after cutting the burr or flash 131. The cutting structure 1311 may be a bevel that intersects the first plane 122 and intersects the side surface 125.

Of course, fig. 4-6 are merely examples of the present application and should not be construed as limiting the present application.

For example, in other alternative embodiments, the first engagement surface 123, the second engagement surface 124, or the third engagement surface 126 may be configured as other surfaces, for example, the first engagement surface 123, the second engagement surface 124, or the third engagement surface 126 may be configured as a beveled or wave-shaped surface, or the like. For another example, the first plane 122 and the first vertical plane 121 may directly intersect perpendicularly. For another example, the cutting structure 1311 may be a plane parallel to the first plane 122.

The present application also provides a mold for preparing a leaf spring body, the mold comprising an upper mold and a lower mold, the upper mold and the lower mold being formed with a cavity after passing by, the shape of the cavity being identical to the shape of the leaf spring body described in any one of the possible implementations of the embodiments of the present application.

The application also provides a leaf spring assembly, including above-mentioned leaf spring body, the both ends nest of this leaf spring body is on the leaf spring seat, and this leaf spring seat and frame fixed connection, the middle part of this leaf spring body is fixed on the axletree through U-shaped bolt.

The application also provides a leaf spring assembly, including above-mentioned leaf spring body, the both ends of this leaf spring body are fixed to be provided with the metal and are rolled up the ear, and this metal is rolled up ear and frame fixed connection, and the middle part of this combined material leaf spring body passes through U-shaped bolt fastening on the axletree.

It should be understood that the leaf spring body, the composite leaf spring and the composite leaf spring body described in the specification of the present application may be resin-based fiber composite leaf spring bodies, which may also be simply referred to as leaf springs, which are not limited in this application.

It should be noted that, on the premise of no conflict, the embodiments described in the present application and/or the technical features in the embodiments may be arbitrarily combined with each other, and the technical solutions obtained after the combination should also fall into the protection scope of the present application.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The plate spring body is provided with a parabolic structure, the convex surface of the parabolic structure is the upper surface of the plate spring body, and the concave surface of the parabolic structure is the lower surface of the plate spring body;

it is characterized in that the method comprises the steps of,

a step structure is formed between the side surface and the upper surface of the parabolic structure;

the step structure comprises a first vertical surface perpendicular to the upper surface and a first plane perpendicular to the first vertical surface, and a first connection surface is formed between the upper surface and the first vertical surface.

2. The leaf spring body of claim 1, wherein a cut structure is formed between the first plane and the side surface, the cut structure being a structure formed after cutting burrs or flash of the leaf spring body.

3. The leaf spring body according to claim 1, wherein a length of a first line segment formed by the first vertical surface intersecting a cross section perpendicular to a length direction of the leaf spring body is less than or equal to 2/3 of a length of a second line segment formed by the side surface intersecting the cross section.

4. The leaf spring body of claim 3 wherein the first line segment has a length ranging from: 0.5 mm-50 mm.

5. The leaf spring body of claim 3 wherein the second line segment has a length ranging from: 10 mm-200 mm.

6. The leaf spring body of claim 1, wherein the first plane intersects a cross section perpendicular to the length direction of the leaf spring body to form a line segment having a length ranging from: 0.2 mm-10 mm.

7. The leaf spring body of claim 1, wherein when the first engagement surface is a transitional arcuate surface, the radius of the arc formed by the intersection of the first engagement surface with a cross section perpendicular to the length direction of the leaf spring body is in the range of: 2 mm-20 mm.

8. The leaf spring body of claim 1 wherein the first vertical face and the first plane intersect perpendicularly.

9. The leaf spring body according to claim 1, wherein a second engagement surface is formed between the first vertical surface and the first plane, and a length of an intersection line of the first engagement surface and a cross section perpendicular to a length direction of the leaf spring body is greater than or equal to a length of an intersection line of the second engagement surface and the cross section.

10. The leaf spring body of claim 9 wherein, when the second engagement surface is a transitional arcuate surface, the radius of the arc formed by the intersection of the second engagement surface and the cross-section is in the range of: 0.5 mm-5 mm.

11. The leaf spring body of claim 9, wherein when the second engagement surface is a transition slope, the included angle between the second engagement surface and the first plane is in the range of 10 ° to 80 °, and/or the length of a line segment formed by the intersection of the second engagement surface and the cross section is in the range of: 0.5 mm-7 mm.

12. The leaf spring body according to claim 1, wherein a third engagement surface is formed between the side surface and the lower surface, and a length of an intersection line of the first engagement surface and a cross section perpendicular to a length direction of the leaf spring body is smaller than or equal to a length of an intersection line of the third engagement surface and the cross section.

13. The leaf spring body of claim 12 wherein the length of the intersection of the upper surface with the cross-section is less than or equal to the length of the intersection of the lower surface with the cross-section.

14. A mold for preparing a leaf spring body, comprising:

an upper die and a lower die;

wherein the upper and lower molds are formed with cavities after fastening, the shape of the cavities being the same as the shape of the leaf spring body according to any one of claims 1 to 13.

15. A leaf spring assembly, comprising:

the leaf spring body according to any one of claims 1 to 13, having both ends nested on leaf spring seats fixedly connected to a vehicle frame, the middle part of the leaf spring body being fixed to an axle by a U-bolt; or, the leaf spring body according to any one of claims 1 to 13, wherein metal lugs are fixedly arranged at two ends of the leaf spring body, the metal lugs are fixedly connected with the frame, and the middle part of the leaf spring body is fixed on the axle through a U-shaped bolt.