CN210661161U

CN210661161U - Variable-rigidity composite plate spring

Info

Publication number: CN210661161U
Application number: CN201921731571.7U
Authority: CN
Inventors: 史文库; 刘鹤龙; 陈志勇
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2019-10-16
Filing date: 2019-10-16
Publication date: 2020-06-02
Anticipated expiration: 2029-10-16

Abstract

The utility model discloses a become rigidity combined material leaf spring, include: the main spring is of an arc-shaped structure; the connecting block is detachably connected to the middle position of one side surface of the main spring at one side; the auxiliary spring is of an arc-shaped structure, and the middle position of the surface of one side of the auxiliary spring is connected to the other side of the connecting block; the middle position of the auxiliary spring extends downwards to form a concave surface part, and the concave surface part is matched with the connecting block; the lower clamping plate is arranged in the middle of the bottom of the auxiliary spring; the top of the lower clamping plate is provided with a groove, the bottom of the lower clamping plate is provided with a bulge, and the groove is matched with the bottom of the concave surface part. Through main spring and vice spring cooperation, can provide bigger rigidity and intensity when bearing load, can dismantle through connecting block and main spring and vice spring and be connected simultaneously, prevent to punch on vice spring, improve the life of leaf spring.

Description

Variable-rigidity composite plate spring

Technical Field

The utility model relates to a become rigidity combined material leaf spring belongs to car leaf spring field.

Background

With the problem of energy shortage becoming more and more serious, the light weight design of automobiles becomes an inevitable trend of industry development. At present, light weight design of automobiles is mainly carried out from the aspects of optimizing structures, improving production processes, replacing materials and the like, and Fiber Reinforced Plastic (FRP) has the advantages of corrosion resistance, fatigue resistance, high specific strength, large specific modulus and the like, so that the FRP is more and more widely applied to automobiles.

The suspension is one of the important assemblies in the automobile, and can elastically connect the frame and the axle, and the plate spring is used as the elastic element of the suspension, and is widely applied due to the advantages of simple structure, reliable operation and the like. The composite leaf spring is used for replacing an original leaf spring, so that the weight of a suspension system can be effectively reduced under the condition of ensuring the design requirement, and the composite leaf spring has very important significance.

At present, research aiming at the composite material plate spring is more and more extensive, related patents are continuously increased, but related reports of the composite material plate spring with variable rigidity are less. In a leaf spring having a main and auxiliary spring structure, in order to ensure reliability and light weight, a metal main spring is usually reserved, and an original steel plate auxiliary spring is replaced with a composite auxiliary spring. Because the bending moment force borne by the middle section of the plate spring is large, if the middle drilling treatment is carried out on the composite plate spring, the strength of the composite plate spring is reduced, the composite plate spring is subjected to premature fatigue failure, and the middle of the composite plate spring is not suitable to be drilled, so that the connection and positioning problems of the composite auxiliary spring and the metal main spring need to be carefully researched. Meanwhile, the metal main spring is not changed as much as possible in consideration of the actual production cost. And the problem of short service life of the main spring and the auxiliary spring due to the impact effect of the auxiliary spring during working needs to be solved.

Therefore, there is a need to provide a new variable stiffness composite leaf spring to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a developed a become rigidity combined material leaf spring, through main spring and vice spring cooperation, can provide bigger rigidity and intensity when bearing load, can dismantle with main spring and vice spring through the connecting block simultaneously and be connected, prevent to punch on vice spring, improve the life of leaf spring.

The utility model provides a technical scheme does:

a variable stiffness composite leaf spring comprising:

the main spring is of an arc-shaped structure;

the connecting block is detachably connected to the middle position of one side surface of the main spring at one side;

the auxiliary spring is of an arc-shaped structure, and the middle position of the surface of one side of the auxiliary spring is connected to the other side of the connecting block;

the middle position of the auxiliary spring extends downwards to form a concave surface part, and the concave surface part is matched with the connecting block;

the lower clamping plate is arranged in the middle of the bottom of the auxiliary spring;

the top of the lower clamping plate is provided with a groove, the bottom of the lower clamping plate is provided with a bulge, and the groove is matched with the bottom of the concave surface part.

Preferably, the method further comprises the following steps:

an upper clamp plate disposed at a middle position of the other side surface of the main spring;

and a lower clamp plate disposed at a middle position of the other side surface of the auxiliary spring.

Preferably, the method further comprises the following steps:

a first internal threaded hole provided at a middle position of the main spring;

the second internal thread hole is formed in the connecting block and is coaxial with the first internal thread hole;

and the connecting bolt is provided with an external thread, is arranged at the first internal thread hole and the second internal thread hole in a matching manner, and is used for fixing the main spring and the connecting block.

Preferably, the method further comprises the following steps:

and the two U-shaped bolts are oppositely arranged at two ends of the upper clamping plate and are used for positioning the plate spring and the axle.

Preferably, both ends of the upper clamping plate extend upwards to form extension parts for limiting the U-shaped bolt.

Preferably, the two ends of the auxiliary spring are symmetrically provided with the buffer pads.

Preferably, the connecting block is of a boss-shaped structure.

Preferably, one end of the main spring is provided with a flat rolling lug, and the other end of the main spring is provided with an upper rolling lug.

Preferably, the cushion pad is made of rubber.

Preferably, the auxiliary spring is made of a composite material.

Beneficial effect:

(1) by adopting a main and auxiliary spring structure, the variable-rigidity suspension can be realized, and when bearing a small load, the main spring acts to provide smaller rigidity; when bearing a large load, the composite material auxiliary spring and the main spring act simultaneously, so that higher rigidity and strength can be provided, and the riding comfort and safety are improved;

(2) the main spring of the original steel plate spring is not changed, the production is convenient, meanwhile, the auxiliary spring and the connecting block are made of composite materials, the weight reduction of a suspension system can be realized, the requirement of light weight is met, and the replacement is convenient;

(3) the matched structure of the boss and the groove is adopted, so that the positioning of the composite material auxiliary spring and the steel plate main spring and the transmission of longitudinal force are realized, the middle part of the composite material is prevented from being perforated, and the safety can be improved;

(4) the buffer pad is adhered to the end face of the auxiliary spring made of the composite material, so that the impact between the main spring and the auxiliary spring when the auxiliary spring starts to work can be relieved, and the service life of the main spring and the service life of the auxiliary spring can be prolonged.

Drawings

Fig. 1 is an axonometric view of the variable stiffness composite leaf spring of the present invention.

Fig. 2 is a front view of the variable stiffness composite leaf spring of the present invention.

Fig. 3 is a middle section view of the variable stiffness composite plate spring of the present invention.

Fig. 4 is a schematic structural view of the upper plate of the present invention.

Fig. 5 is a schematic structural diagram of the main spring of the present invention.

Fig. 6 is a schematic structural diagram of the connecting block of the present invention.

Fig. 7 is a cross-sectional view taken along line a-a of the connecting block of the present invention.

Fig. 8 is a schematic structural diagram of the auxiliary spring of the present invention.

Fig. 9 is a schematic structural diagram of the cushion pad according to the present invention.

Fig. 10 is a schematic structural view of the lower splint according to the present invention.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

As shown in fig. 1-10, the present invention provides a variable stiffness composite leaf spring, comprising: upper clamp plate 100, main spring 200, connecting block 300, auxiliary spring 400, lower clamp plate 500, and connecting bolt 600.

As shown in fig. 1 to 3, the upper clamp 100 is disposed at the middle of the main spring 200, the main spring 200 has an arc structure with a lug at both ends, the connecting block 300 is mounted at the middle of the bottom of the main spring, the sub spring 400 is mounted at the bottom of the connecting block 300, the lower clamp 500 is mounted at the middle of the bottom of the sub spring 400, and two U-bolt clamps are mounted at both ends of the main spring 200 and the sub spring 400 for preventing the lateral movement of the leaf spring.

As shown in fig. 4-8, the upper clamping plate 100 is rectangular, two ends of the upper clamping plate extend upwards to form extension parts, a through hole is formed in the middle of the upper clamping plate 100, the main spring 200 is arc-shaped, the main spring 200 is a steel plate spring with equal width, two ends of the main spring 200 are provided with a rolling lug, wherein one end of the main spring 200 is provided with an upper rolling lug 220, the other end of the main spring is provided with a flat rolling lug 210, and a first internal thread hole is formed in the middle of the main spring 200. Vice spring 400 is the arc structure, and vice spring 400's middle part downwardly extending forms the extension, and the extension is boss shape structure, and the upper surface undercut of extension forms first recess. The auxiliary spring 400 has two ends provided with buffer pads 410, respectively, which have a rectangular parallelepiped structure.

In the present invention, it is preferable that the cushion 410 and the auxiliary spring are fixed by being bonded to each other.

As shown in fig. 9, in the present invention, the cushion 410 is preferably made of rubber.

In the present invention, it is preferable that the main spring 200 be a leaf spring having an equal width and the sub spring 400 be a leaf spring having an equal width.

In the present invention, as a preferable choice, the auxiliary spring 400 is made of a glass fiber/epoxy resin composite material.

Connecting block 300 is boss shape structure, and the up end and the lower terminal surface of connecting block 300 are the plane to the terminal surface area of up end is greater than the terminal surface area of terminal surface down, and connecting block 300 matches the setting with the extension, makes the up end of connecting block 300 and the intermediate position contact of main spring 200 bottom, and the terminal surface contacts with the recess of extension down, makes connecting block 200 set up in the extension. The second internal thread hole has been seted up at the middle part of connecting block 300, the second internal thread hole is the same with the first internal thread hole structure of setting on main spring 200, and coaxial setting, connecting bolt 600 has the external screw thread, connecting bolt 600's one end passes connecting block 300 and main spring 200 back in proper order, set up with first internal thread hole and second internal thread hole phase-match, it is fixed with main spring 200 and connecting block 300, connecting bolt 600's the other end should not exceed the bottom of connecting block, connecting bolt 600's one end is passed behind main spring 200 simultaneously and is fixed a position with passing through the nut, the through-hole cover of punch holder 100 is in the outside of nut.

As shown in fig. 10, the lower plate 500 is disposed at the bottom of the auxiliary spring 400 and contacts with the extension portion, a second groove is disposed at the middle position of the lower plate 500 and can match with the boss-shaped structure of the extension portion to wrap the extension portion, and a cylindrical protrusion is disposed at the bottom center position of the lower plate 500 and is used for positioning and transmitting force between the lower plate and the axle.

The extension part at the middle position of the auxiliary spring 400 is matched with the boss-shaped structure of the connecting block 300, so that the longitudinal positioning and transmission force can be achieved. The cushion 410 is fixedly connected to the upper surfaces of both ends of the auxiliary spring 400, so that the purpose of alleviating impact can be achieved. The structure can reduce the mass of the plate spring assembly and meet the trend of light weight; the punching of the dangerous section in the middle of the auxiliary spring made of the composite material is avoided, and the safety is improved; the cushion 410 is mounted to reduce the impact between the main spring 200 and the auxiliary spring 400, and to improve the service life of the main spring 200 and the auxiliary spring 400.

When in use, the components are assembled firstly, and the assembling method comprises the following steps:

fixing the upper end face of the connecting block 300 and the straight section of the middle position of the bottom of the main spring 200 through a connecting bolt 600 to form a main spring-connecting block assembly;

fixedly connecting the buffer 410 with the auxiliary spring 400 in an adhesive manner to form an auxiliary spring-buffer assembly;

after the upper clamp plate 100, the main spring-connecting block assembly, the auxiliary spring-cushion pad assembly and the lower clamp plate 500 are sequentially stacked from top to bottom, two U-shaped bolts are placed at two ends of the upper clamp plate 100, the U-shaped bolts are limited by the extension part of the upper clamp plate 100, and the two U-shaped bolts are clamped to limit transverse movement.

During operation, under the action of a vertical force, the main spring 200 deforms vertically, when the plate spring bears a relatively small load, the main spring 200 is not in contact with the buffer pad 410, only the main spring 200 works at the moment, and the rigidity of the plate spring is equal to that of the steel plate main spring 200; when a large load is applied, the main spring 200 is first in contact with the cushion 410 when being deformed in the vertical direction, and gradually and completely contacts the auxiliary spring 400 as the load increases, and the rigidity of the leaf spring is equal to the sum of the rigidity of the main spring 200 and the rigidity of the auxiliary spring 400. Therefore, the variable-rigidity composite plate spring can provide small rigidity under small load and provide large rigidity under large load, and is beneficial to improving riding comfort.

While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.

Claims

1. A variable stiffness composite leaf spring comprising:

the main spring is of an arc-shaped structure;

2. The variable stiffness composite leaf spring of claim 1 further comprising:

3. The variable stiffness composite leaf spring of claim 2 further comprising:

4. The variable stiffness composite leaf spring of claim 3 further comprising:

5. The variable stiffness composite leaf spring of claim 4 wherein the upper clamp plate extends upwardly at both ends to form extensions for restraining the U-bolt.

6. The variable stiffness composite leaf spring of claim 5 wherein the secondary spring is symmetrically provided with cushioning pads at both ends.

7. The variable stiffness composite leaf spring of claim 6 wherein the connecting block is a boss-shaped structure.

8. The variable stiffness composite leaf spring of claim 7 wherein the main spring is provided with a flat crimp at one end and an upper crimp at the other end.

9. The variable stiffness composite leaf spring of claim 8 wherein the cushioning pad is formed of a rubber material.

10. The variable stiffness composite leaf spring of claim 9 wherein the secondary spring is a composite material.