CN215751773U

CN215751773U - Composite material plate spring body, mold for preparing plate spring body and plate spring assembly

Info

Publication number: CN215751773U
Application number: CN202121918483.5U
Authority: CN
Inventors: 董轩诚
Original assignee: Xi'an Shengerwei Composite Material Co ltd
Current assignee: Xi'an Shengerwei Composite Material Co ltd
Priority date: 2021-08-17
Filing date: 2021-08-17
Publication date: 2022-02-08
Anticipated expiration: 2031-08-17

Abstract

The application provides a composite leaf spring body, a mold for manufacturing the leaf spring body and a leaf spring assembly, wherein the leaf spring body has a parabolic structure, a concave parabola is the upper surface of the leaf spring body, a convex parabola is the lower surface of the leaf spring body, the surface adjacent to the upper surface and the lower surface is the side surface of the leaf spring body, the side surface is inwards extended at a region close to the upper surface to form a first inner chamfer, and/or the side surface is inwards extended at a region close to the lower surface to form a second inner chamfer. The application provides a leaf spring body can be on the basis of guaranteeing the mechanical properties of combined material leaf spring, cutting burr or overlap.

Description

Composite material plate spring body, mold for preparing plate spring body and plate spring assembly

Technical Field

The present invention relates to a suspension for an automobile, and more particularly, to a composite leaf spring body, a mold for manufacturing the leaf spring body, and a leaf spring assembly.

Background

With the increasing consumption of global fossil energy and the increasing emphasis on environmental issues, the speed of innovation of new materials and technology in the automobile industry is increasing. The lightweight car not only can greatly reduce the consumption of people to fossil energy, but also can improve the cargo capacity of the car and increase the service efficiency of the car. The composite material has the characteristics of light weight and high strength, and also has better shock absorption and fatigue life, so the composite material is widely applied to the field of automobiles.

The composite material is widely researched by a plurality of automobile manufacturers in recent years as a plate spring material for automobiles, and is also commercially applied to a part of automobile models.

In the related art, the forming process of the composite plate spring is generally divided into a continuous Filament Winding (fiber Winding) process and a compression Molding (Compressing Molding) process.

Most of manufacturers research and develop composite material plate springs by adopting a die pressing process, the precision of the composite material plate springs is high relative to a fiber winding process, and the surfaces of the composite material plate springs are smooth after products are formed without secondary processing. Resin Transfer Molding (RTM) is a typical Molding process, and specifically, a preformed fiber reinforcement material is placed in a mold cavity that requires peripheral sealing and fastening and ensures that the Resin flows smoothly inside; after the mould is closed, a certain amount of resin is injected, and after the resin is solidified, the desired product can be obtained by demoulding. However, in the mold pressing process, burrs or flashes are formed on the side surfaces of the composite plate spring in the process of sealing the mold, and in this case, after the upper mold and the lower mold are separated, that is, after the product is demolded, the burrs or flashes need to be removed through cutting operation.

Therefore, how to cut burrs or flashes on the basis of ensuring the mechanical property of the composite plate spring is a technical problem which needs to be solved in the field.

SUMMERY OF THE UTILITY MODEL

The application provides a combined material leaf spring body, a mould and a leaf spring assembly for preparing the leaf spring body, can be on the basis of guaranteeing the mechanical properties of combined material leaf spring, cutting burr or overlap.

In a first aspect, the present application provides a composite leaf spring body having a parabolic configuration, the concave parabola being the upper face of the leaf spring body, the convex parabola being the lower face of the leaf spring body, the faces adjacent to the upper face and the lower face being the side faces of the leaf spring body, the side faces extending inwardly in a region adjacent to the upper face to form a first inner chamfer, and/or the side faces extending inwardly in a region adjacent to the lower face to form a second inner chamfer.

In this embodiment, through setting up first interior chamfer and/or second interior chamfer, the leaf spring body of relative rectangular cross section, even the side of combined material leaf spring is formed with burr or overlap, also form burr or overlap in the middle zone of the side of leaf spring body, based on this, only need cut away burr or overlap that this middle zone formed can, can reduce the cutting area to burr or overlap from this, the probability of producing broken fiber has been reduced, and then, can reduce the cutting region of leaf spring and appear the possibility of coming unstuck and promote the mechanical properties of leaf spring body.

In addition, by arranging the first inner chamfer and/or the second inner chamfer, cutting of the side surface in the area close to the upper surface and the side surface in the area close to the lower surface is avoided, and the side surface can be ensured not to have broken fiber yarns in the area close to the upper surface and the area close to the lower surface, whereas in the case of a stressed leaf spring body the edge area of the leaf spring body, i.e. the area of the side near the upper face and the area of the side near the lower face, tends to be the area where the stress is most concentrated, in the present application, by providing the first inner chamfer and/or the second inner chamfer, the continuity of the filaments in the edge region of the leaf spring body, i.e. the region of the side face near the upper face and the region of the side face near the lower face, can be ensured, furthermore, the possibility of degumming of the edge area of the plate spring is reduced as much as possible, and the mechanical property of the plate spring body is improved.

In addition, because under the condition that the plate spring body is stressed, the region (namely, the region provided with the first inner chamfer and/or the second inner chamfer) with the shape mutation in the plate spring body is often the region with the most concentrated stress, in the application, the structure formed by the inward extension of the region close to the upper side of the side face and the structure formed by the inward extension of the region close to the lower side of the side face are designed to be the inner chamfers, the amplitude of the mutation can be reduced, and further, the stress distribution of the region (namely, the region provided with the first inner chamfer and/or the second inner chamfer) with the shape mutation in the plate spring body is more uniform, in other words, the mechanical property of the composite plate spring body can be improved.

In short, this application can be on the basis of guaranteeing the mechanical properties of combined material leaf spring, cutting burr or overlap through setting up first interior chamfer and/or second in on the leaf spring body.

In some possible implementations, the side surface is formed with a first inner chamfer extending inwardly in a region near the upper face and/or the side surface is formed with a second inner chamfer extending inwardly in a region near the lower face, the side surface is formed with a raised clamping seam between the first inner chamfer and the second inner chamfer, the clamping seam has a width greater than a gap thickness between an upper die and a lower die used to prepare the leaf spring body, the gap thickness being a gap-forming thickness of the upper die and the lower die after fastening.

In this embodiment, the width of the die joint is designed to be larger than the thickness of the gap between the upper die and the lower die, so that burrs or flashes do not occur in the edge region of the plate spring body (i.e., the region where the side surface is close to the upper surface and the region where the side surface is close to the lower surface), in other words, burrs or flashes formed in the process of sealing the die can be guaranteed to occur only in the die joint between the first inner chamfer and the second inner chamfer.

In some possible implementations, the width of the clamp gap is greater than the thickness of the clamp gap.

In some possible implementations, the compound die gap is a trapezoidal structure.

Because under the condition of leaf spring body atress, the region that the shape takes place the sudden change in the leaf spring body (be provided with the region of first interior chamfer and second interior chamfer promptly) often is the region that the atress was most concentrated, this application designs this compound die seam into trapezium structure, can reduce the range of sudden change, and then, make the region that the shape takes place the sudden change in the leaf spring body (be provided with the region of first interior chamfer and second interior chamfer promptly) the distribution of atress become more even, in other words, can promote the mechanical properties of combined material leaf spring body.

In some possible implementations, the side face is formed with the first inner chamfer extending inward only in a region near the upper face, a land of the leaf spring body is formed between the first inner chamfer and a region of the side face that does not extend inward, a width of the land is greater than a gap thickness between an upper die and a lower die used to prepare the leaf spring body, the gap thickness being a thickness of a gap formed by the upper die and the lower die after fastening.

In this embodiment, by designing the width of the mating surface to be larger than the thickness of the gap between the upper die and the lower die, it can be ensured that burrs or flashes do not occur in the edge region of the plate spring body (i.e., the region where the side surface is close to the upper surface and the region where the side surface is close to the lower surface), in other words, it can be ensured that burrs or flashes formed during the process of sealing the die only occur on the mating surface formed between the first inner chamfer and the region of the side surface that does not extend inward.

In some possible implementations, the land is inclined relative to a plane in which the non-inwardly extending region lies.

Because under the condition of leaf spring body atress, the region (be provided with first interior chamfer region promptly) that the shape takes place the sudden change in the leaf spring body is often the region that the atress is most concentrated, and this application designs this compound die surface for the plane slope that is not the region place of this inwardly extending relatively, can reduce the range of sudden change, and then, makes the region (be provided with the region of first interior chamfer) atress distribution that the shape takes place the sudden change in the leaf spring body become more even, in other words, can promote the mechanical properties of combined material leaf spring body.

In some possible implementations, the first inner chamfer and the second inner chamfer are both R-angles.

In some possible implementations, the value of the R angle is less than half of a first side length, the first side length being a side length of the side, the first side length being perpendicular to the upper or lower face.

Because under the condition of the stress of the plate spring body, the region (namely the region provided with the first inner chamfer and the second inner chamfer) with the shape mutation in the plate spring body is often the region with the most concentrated stress, the value of the R angle is designed to be less than half of the length of the first edge, the amplitude of the mutation can be reduced as much as possible, and further, the stress distribution of the region (namely the region provided with the first inner chamfer and the second inner chamfer) with the shape mutation in the plate spring body is more uniform, in other words, the mechanical property of the composite plate spring body can be improved.

In some possible implementations, the first inner chamfer and the second inner chamfer are both beveled angles.

In some possible implementations, the chamfer angle ranges from 25 degrees to 65 degrees.

Because under the condition of leaf spring body atress, the region that the shape in the leaf spring body takes place the sudden change (be provided with the region of first interior chamfer and second interior chamfer promptly) often is the region that the atress was most concentrated, this application designs the value of this chamfer for the scope is 25 degrees to 65 degrees, can reduce the range of sudden change, and then, make the region that the shape in the leaf spring body takes place the sudden change (be provided with the region of first interior chamfer and second interior chamfer promptly) the distribution of stress become more even, in other words, can promote the mechanical properties of combined material leaf spring body.

In a second aspect, a mold for producing a leaf spring body is provided, the mold being provided with a mold cavity inside, the mold cavity having the same shape as the leaf spring body in the first aspect or any one of the possible implementations of the first aspect.

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

according to the first aspect or any one of the possible implementations of the first aspect, the two ends of the leaf spring body are fixedly provided with the metal lugs, the metal lugs are fixedly connected with the vehicle frame, and the middle part of the composite leaf spring body is fixed on the vehicle axle through the U-shaped bolt.

Drawings

Fig. 1 is a schematic view of the installation of the leaf spring assembly provided in the present application.

Fig. 2 is a schematic view of a composite leaf spring assembly provided in an embodiment of the present application.

Fig. 3 and 4 are schematic cross-sectional views of a leaf spring body provided with an R-angle according to an embodiment of the present application.

Figures 5 and 6 are schematic cross-sectional views of a leaf spring body provided with a chamfer according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

The leaf spring can be placed in the longitudinal direction or in the transverse direction on the motor vehicle. The latter has to be provided with additional guiding force-transmitting devices for transmitting longitudinal force, which makes the structure complicated and the mass enlarged, so the latter is only applied to a few light and miniature vehicles. The longitudinal leaf spring can transmit various forces and moments, has a guiding function, and is simple in structure, so that the longitudinal leaf spring is widely applied to automobiles.

As shown in fig. 1, the leaf spring assembly includes a leaf spring body 13, two U-bolts 14 are provided in the middle of the leaf spring body 13 for fixing the leaf spring body 13 to the axle 15, and the front end of the leaf spring body 13 is fixed to the vehicle body 11 (frame) through the front rolling lug 131 of the leaf spring body 13 and the front bracket 12; the rear end of the steel plate leaf spring body 13 is fixed to the vehicle body 11 (vehicle frame) via the rear lug 132 of the steel plate leaf spring body 13, the lug 16, and the rear bracket 17.

The steel plate leaf spring body 13 can be composed of a plurality of steel plates, the width of the single steel plate body is unchanged, the thickness of the single steel plate body is equal to the thickness of the single steel plate body, the single steel plate body has two types of sections, namely an equal section and a variable section, the variable section is also divided into a linear variable section and a parabolic variable section, and the parabolic variable section is mostly adopted for the variable section leaf spring because the stress of each part of the parabolic variable section is equal.

With technological development, composite materials are increasingly used for automotive suspension spring elements. The composite material has high specific strength modulus, and good fatigue resistance, damping performance and corrosion resistance, so that the composite material is used as an elastic element, the smoothness and comfort of a vehicle can be greatly improved, the mass is only about 1/4 of a steel plate spring, the fuel efficiency is effectively improved, the unsprung mass is reduced, the unsprung vibration is reduced, the service life is greatly prolonged, the elastic element does not need to be replaced within the service life range of the whole vehicle, and the use and maintenance cost of the whole vehicle is relatively low.

The concept of composite material means that one material can not meet the use requirement, and two or more materials are required to be compounded together to form another material which can meet the requirement of people, namely the composite material. As an example, a single glass fiber, although strong, is loose, can only withstand tensile forces, cannot withstand bending, shearing, and compressive stresses, and cannot be easily formed into a fixed geometric shape, which is a loose body. If they are bonded together with synthetic resin, they can be made into various rigid products with fixed shapes, which can bear not only tensile stress, but also bending, compression and shearing stress, and can be formed into glass fiber reinforced plastic matrix composite material. Because the strength of the glass fiber reinforced plastic is equivalent to that of steel, the glass fiber reinforced plastic also contains glass components and has the properties of color, shape, corrosion resistance, electric insulation, heat insulation and the like similar to glass, and the glass fiber reinforced plastic can be also called as glass fiber reinforced plastic.

Composite materials are of many types and generally consist of a reinforcement material and a matrix material, for example, reinforced concrete is also a composite material, concrete is a matrix, and reinforced steel is a reinforcement material.

The matrix material includes, but is not limited to, epoxy resin, polyester resin, thermoplastic resin, and the like. 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 consisting of resin and a curing agent. As an example, the resin matrix may include a thermosetting resin and a thermoplastic resin. Thermosetting resins can be heated and molded only once and cured during processing to form infusible and insoluble network cross-linked high molecular compounds, and thus cannot be regenerated. The resin matrix of the composite material is mainly thermosetting resin. Thermosetting 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 fibres (Reinforced fibers), i.e. reinforcement of a resin-based composite material. By way of example, the reinforcing material includes, in terms of geometry, zero-dimensional particles, one-dimensional fibers, two-dimensional sheets (e.g., cloths or felts), and three-dimensional solid structures. Inorganic reinforcing materials and organic reinforcing materials, which may be synthetic or natural, are classified by their properties. The inorganic reinforcing material may be fibrous, such as inorganic glass fibers, carbon fibers, and a small amount of ceramic fibers such as silicon carbide, and the organic reinforcing material may include 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 fiber, carbon fiber, or a fiber bundle composed of glass fiber and carbon fiber, and the matrix material thereof may be epoxy resin or the like, which may also be referred to as a fiber-Reinforced Plastic (FRP) plate spring body.

Compared with the traditional metal material, the characteristics of the composite plate spring are mainly characterized by high specific strength, high specific modulus, good temperature resistance, good impact resistance, strong designability, more than 70% weight reduction, safe fracture and the like. Many foreign countries have used composite leaf springs in mass production vehicles, and many automobile manufacturers both at home and abroad are developing composite leaf springs. The installation of a composite leaf spring is similar to the installation of a steel leaf spring, requiring the middle to be fixed to the axle like a steel leaf spring, with both ends connected to the body. However, since it is difficult to make the eye at both ends of the composite plate spring, it is necessary to make the member like the eye.

As shown in fig. 2, the composite leaf spring assembly 20 may include a composite leaf spring body 23, both ends of the composite leaf spring body 23 being provided with a lug-

like member

231 and 232, respectively, to connect both ends of the composite leaf spring body 23 to a vehicle body (frame); the middle part 24 of the composite leaf spring body 23 is fixed to the axle by means of U-bolts. As one example provided herein, the lug-

like members

231 and 232 may be frame hinge barrels. Optionally, the ear-

like members

231 and 232 may further include a plate spring clamping plate, and the frame hinge tube is fixedly connected to the plate spring clamping plate, for example, the plate spring clamping plate and the frame hinge tube may form a U-shaped structure; alternatively, the plate spring holding plate may be fixedly connected to a metal plate embedded in the composite plate spring body 23, or may be fixedly connected to the composite plate spring body 23 by fastening bolts. Alternatively, the U-shaped bolt may be fixedly connected to a metal plate embedded in the composite plate spring body 23, or may be fixedly connected to the composite plate spring body 23 by a fastening bolt.

The forming process of the composite plate spring is generally classified into a continuous Filament Winding (Filament Winding) process and a compression Molding (compression Molding) process.

Based on this, the application provides a combined material leaf spring body, a mould and leaf spring assembly for preparing the leaf spring body, can be on the basis of guaranteeing combined material leaf spring's mechanical properties, cutting burr or overlap.

In some embodiments, the leaf spring body has a parabolic configuration, the concave parabola being an upper face of the leaf spring body, the convex parabola being a lower face of the leaf spring body, the faces adjacent to the upper face and the lower face being side faces of the leaf spring body, the side faces extending inwardly in a region adjacent to the upper face forming a first inner chamfer, and/or the side faces extending inwardly in a region adjacent to the lower face forming a second inner chamfer.

In addition, because under the condition that the plate spring body is stressed, the region (namely, the region provided with the first inner chamfer and/or the second inner chamfer) with the shape mutation in the plate spring body is often the region with the most concentrated stress, in the application, the structure formed by inwards extending the region close to the upper surface of the side surface and the structure formed by inwards extending the region close to the lower surface of the side surface are designed to be the inner chamfers, the amplitude of the mutation can be reduced, furthermore, the stress distribution of the region (namely, the region provided with the first inner chamfer and the second inner chamfer) with the shape mutation in the plate spring body is more uniform, in other words, the mechanical property of the composite plate spring body can be improved.

The chamfering refers to a process of cutting the edge of the workpiece into a predetermined slope. The chamfer includes an inner chamfer and an outer chamfer. The outer chamfer is the chamfer formed by the portion that protrudes outward as seen, while the inner chamfer is the chamfer formed by the portion of the pattern or part that is recessed inward. The chamfering is generally intended to prevent damage to other objects or persons due to the acute angle formed when machining hard objects, and also to facilitate the function of the coupler moving in the hole. However, the inner chamfer in the embodiment of the present application mainly plays two roles: firstly, the cutting area of burrs or flashes on the side surface of the plate spring body is reduced, so that the probability of fiber breakage is reduced, the possibility of degumming in the cutting area of the plate spring is reduced, and the mechanical property of the plate spring body is improved; secondly, the fiber filaments are continuous in the edge area of the plate spring body (namely the area of the side surface close to the upper surface and the area of the side surface close to the lower surface) so as to improve the mechanical property of the plate spring body.

The chamfer referred to in the present application may be a chamfer or a fillet. For example, the chamfer may be a 45 degree edge chamfer, which may also be referred to as a C-angle. The rounded corner can also be referred to as an R-angle, and the value of the R-angle can be used to represent the radius of the transition circular arc where two straight lines intersect, and the radius of the transition circular arc is 3 and 5 as R3, R5, and the like.

In some embodiments, the side surface is formed with a first inner chamfer extending inwardly in a region adjacent to the upper face, and/or the side surface is formed with a second inner chamfer extending inwardly in a region adjacent to the lower face, the side surface is formed with a raised parting line between the first inner chamfer and the second inner chamfer, the parting line has a width greater than a gap thickness between an upper die and a lower die used to prepare the leaf spring body, the gap thickness being a thickness of the upper die and the lower die that forms a gap after fastening. In one implementation, the width of the clamp gap is greater than the thickness of the clamp gap.

In one implementation, the compound die gap is trapezoidal in configuration. Alternatively, the trapezoid structure may be an isosceles trapezoid structure.

In some implementations, the land is inclined relative to a plane in which the non-inwardly extending region lies.

As one example, the first inner chamfer can be a chamfer angle and the first inner chamfer extends to a non-inwardly extending region of the side of the leaf spring body. As another example, the land is inclined relative to a plane in which the non-inwardly extending region lies, and the land is formed between the first inner chamfer and the non-inwardly extending region.

In this embodiment, because under the condition that the leaf spring body is stressed, the region (i.e. the region provided with the first inner chamfer) with the shape that changes suddenly in the leaf spring body is often the region with the most concentrated stress, the present application designs the compound die surface to be inclined relative to the plane where the region that does not extend inwards is located, so that the amplitude of the change can be reduced, and further, the stress distribution of the region (i.e. the region provided with the first inner chamfer) with the shape that changes suddenly in the leaf spring body becomes more uniform, in other words, the mechanical property of the composite leaf spring body can be improved.

In some embodiments, the first inner chamfer and the second inner chamfer are both R-angles. In one implementation, the value of the R angle is less than half of a first side length, the first side length being a side length of the side, the first side length being perpendicular to the upper or lower face.

As an example, the length of the first side is equal to the thickness of the leaf spring body. As another example, the length of the first side is equal to the thickness of the clamp gap.

Fig. 3 and 4 are schematic cross-sectional views of a leaf spring body 30 provided with an R-angle according to an embodiment of the present application.

As shown in fig. 3, the leaf spring body 30 includes an upper surface 31, a lower surface 32, and a surface adjacent to the upper surface 31 and the lower surface 32, which is a side surface of the leaf spring body 30, the side surface is formed with a first inner chamfer 331 extending inward in a region close to the upper surface 31, and the side surface is formed with a second inner chamfer 332 extending inward in a region close to the lower surface 32. Optionally, a convex clamping slot 333 is formed between the first inner chamfer 331 and the second inner chamfer 332, and an upper surface or a lower surface of the clamping slot 333 may be used for bearing burrs or flashes of the leaf spring body 30. Optionally, the first inner chamfer 331 and the second inner chamfer 332 are both R-shaped. Of course, as shown in fig. 4, the leaf spring body 30 may be designed with only one inner chamfer, i.e., the first inner chamfer 331, and the mating surface 337 of the leaf spring body 30 may be formed between the first inner chamfer 331 and the non-inwardly extending region 336 of the side surface, and the mating surface 337 of the leaf spring body 30 may be used for bearing burrs or flashes of the leaf spring body 30.

Of course, in other alternative embodiments, only one second inner chamfer 332 may be designed, and the present application is not limited thereto.

In some embodiments, the first inner chamfer and the second inner chamfer are both chamfers. In one implementation, the chamfer angle ranges from 25 degrees to 65 degrees.

Because under the condition of the stress of the plate spring body, the region (namely the region provided with the first inner chamfer and/or the second inner chamfer) with the shape mutation in the plate spring body is often the region with the most concentrated stress, the value of the chamfer is designed to be in the range of 25 degrees to 65 degrees, the amplitude of the mutation can be reduced as much as possible, and further, the stress distribution of the region (namely the region provided with the first inner chamfer and/or the second inner chamfer) with the shape mutation in the plate spring body is more uniform, in other words, the mechanical property of the composite plate spring body can be improved.

Fig. 5 and 6 are schematic cross-sectional views of a leaf spring body 30 provided with a chamfer angle according to an embodiment of the present application.

As shown in fig. 5, the leaf spring body 30 includes an upper surface 31, a lower surface 32, and a surface adjacent to the upper surface 31 and the lower surface 32, which is a side surface of the leaf spring body 30, the side surface is formed with a first inner chamfer 334 extending inward in a region close to the upper surface 31, and the side surface is formed with a second inner chamfer 335 extending inward in a region close to the lower surface 32. Optionally, a convex clamping slot 333 is formed between the first inner chamfer 334 and the second inner chamfer 335, and an upper surface or a lower surface of the clamping slot 333 may be used for bearing burrs or flashes of the leaf spring body 30. Optionally, the first inner chamfer 334 and the second inner chamfer 335 are both beveled. For example, the chamfer angle is a 45 degree chamfer angle. Of course, as shown in fig. 6, the leaf spring body 30 may be designed with only one inner chamfer, i.e. the first inner chamfer 331, and a mating surface 337 of the leaf spring body 30 is formed between the first inner chamfer 331 and the non-inwardly extending region 336 of the side surface, and the mating surface 337 may be used for bearing burrs or flashes of the leaf spring body 30.

The present application also provides a mold for manufacturing a leaf spring body, the mold being provided with a mold cavity inside, the mold cavity having the same shape as the leaf spring body described in the first aspect or any one of the possible implementations of the first aspect.

The application still provides a leaf spring assembly, including the above leaf spring body, the fixed metal book ear that is provided with in both ends of this leaf spring body, this metal book ear and frame fixed connection, U-shaped bolt fastening is passed through at the middle part of this combined material leaf spring body on the axletree.

It should be understood that the leaf spring body, the composite leaf spring, and the composite leaf spring body described in this specification can all be resin-based fiber composite leaf spring bodies.

It should also be understood that the various embodiments provided herein are not limited to the above description, for example, those skilled in the art may also develop a leaf spring body in which the first and second inner chamfers may be replaced with a stepped structure or the clamping gap may be designed as a stepped structure, based on which more embodiments may be obtained in combination with the adaptive design of the leaf spring body, under the specific teaching of the embodiments herein. Thus, although the present application has been particularly shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present application, and it is intended that all such changes and modifications as fall within the true spirit and scope of the present application be embraced thereby.

Claims

1. A composite leaf spring body having a parabolic configuration with a concave parabola being an upper face of the leaf spring body and a convex parabola being a lower face of the leaf spring body, the faces adjacent to the upper face and the lower face being side faces of the leaf spring body, characterized in that the side faces are inwardly extended in a region close to the upper face to form a first inner chamfer and/or the side faces are inwardly extended in a region close to the lower face to form a second inner chamfer.

2. The leaf spring body according to claim 1, wherein the side surface is formed with the first inner chamfer extending inwardly in a region near the upper face, the side surface is formed with the second inner chamfer extending inwardly in a region near the lower face, the side surface is formed with a raised die gap between the first inner chamfer and the second inner chamfer, the die gap has a width greater than a gap thickness between an upper die and a lower die used for manufacturing the leaf spring body, the gap thickness being a thickness of the upper die and the lower die that forms a gap after fastening.

3. The leaf spring body of claim 2, wherein the width of the die cut is greater than the thickness of the die cut.

4. The leaf spring body of claim 2, wherein the die cut is a trapezoidal structure.

5. The leaf spring body according to claim 1, wherein the side face is formed with the first inner chamfer extending inwardly only in a region near the upper face, and a land of the leaf spring body is formed between the first inner chamfer and a region of the side face not extending inwardly, the land having a width greater than a gap thickness between an upper die and a lower die used for preparing the leaf spring body, the gap thickness being a thickness of a gap formed by the upper die and the lower die after fastening.

6. The leaf spring body of claim 5, wherein the land is inclined relative to a plane in which the non-inwardly extending region lies.

7. The leaf spring body according to any one of claims 1 to 6, wherein the first inner chamfer and the second inner chamfer are both R-angles.

8. The leaf spring body of claim 7, wherein the R angle has a value less than half of a first side length, the first side length being a side length of the side surface, the first side length being perpendicular to the upper or lower face.

9. The leaf spring body according to any one of claims 1 to 6, wherein the first inner chamfer and the second inner chamfer are each beveled angles.

10. The leaf spring body of claim 9, wherein the chamfer angle ranges from 25 degrees to 65 degrees.

11. A mold for manufacturing a leaf spring body, characterized in that the mold is provided with a mold cavity inside, the shape of the mold cavity being the same as the shape of the leaf spring body according to any one of claims 1 to 10.

12. A leaf spring assembly, comprising:

the leaf spring body according to any one of claims 1 to 10, wherein metal lugs are fixedly arranged at both ends of the leaf spring body, the metal lugs are fixedly connected with a vehicle frame, and the middle part of the leaf spring body is fixed on an axle through a U-shaped bolt.