Steel plate spring connecting structure

Abstract

The utility model discloses a steel plate spring connecting structure, and relates to the technical field of automobile parts. Comprising a first plate spring, and the end portions of the first end and the second end in the extending direction of the first plate spring are reversely wound to form winding lugs; the spring eye comprises a spring eye body and a cover plate, at least part of the cover plate is detachably connected to the spring eye body, a containing cavity used for being connected with a hinge piece is formed between the spring eye body and the cover plate, and the first end and the second end are connected to a frame through the hinge piece; by means of the spring eye body and the cover plate which are detachably connected, the cover plate can be separated from the spring eye body, the hinge piece installed in the containing cavity of the spring eye can be conveniently taken out and replaced in time when damaged, and the whole first plate spring even a steel plate spring connecting structure does not need to be completely detached from a vehicle frame when the hinge piece is damaged; and only the damaged hinge piece needs to be detached independently, so that the cost is saved, and the service life of the first plate spring can be prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile parts, and in particular relates to a leaf spring connection structure. Background Art

[0002] Leaf springs are the most widely used elastic elements in commercial vehicle suspension systems. When driving under complex conditions, the vehicle body is subjected to lateral forces, causing the vehicle body to twist. The leaf springs connected to the vehicle body will be twisted and deformed under the action of the roll load. Under this alternating load, the leaf springs installed on the base will become loose, posing a safety hazard to driving. As the main load-bearing element and elastic element of the suspension, leaf springs have great potential in improving vehicle performance, lightweighting and modularization.

[0003] The two ends of a traditional leaf spring are rigidly connected to the frame, so that the leaf spring cannot adapt to different working conditions of vehicle body roll; and because the leaf spring is subjected to external impact for a long time, especially the alternating roll load, it is easy for the leaf spring to become loose; if rotating parts are provided at both ends of the leaf spring and the frame, a rotational connection can be achieved, but because the rotating parts are completely sealed in both ends of the leaf spring, when the rotating parts are damaged, the entire leaf spring can only be removed from the body, and the rotating parts cannot be removed separately, which affects the service life of the leaf spring. Utility Model Content

[0004] The utility model provides a leaf spring connection structure to solve the problems that when a rotating part is damaged, the entire leaf spring can only be removed from the vehicle body but the rotating part cannot be removed separately, the leaf spring cannot be adaptively changed according to different working conditions of vehicle body roll, and the leaf spring is easily loosened due to long-term external impact force, especially the alternating roll load.

[0005] The technical solution adopted by the utility model is:

[0006] A leaf spring connection structure includes a first leaf spring, wherein the first end and the second end of the first leaf spring in the extension direction are respectively wound in opposite directions to form a rolled ear; the rolled ear includes a rolled ear body and a cover plate that is at least partially detachably connected to the rolled ear body, and a receiving cavity for connecting a hinge is formed between the rolled ear body and the cover plate, and the first end and the second end are connected to a vehicle frame through the hinge.

[0007] A leaf spring connection structure of the utility model also has the following additional technical features:

[0008] The interior of the ear body has a hollow cavity, one end of the ear body along the axial direction has a notch, the end of the ear body away from the notch forms a mounting platform for mounting the cover plate, and the end of the ear body close to the notch forms a connecting platform for docking the cover plate between the cavity and both sides along the radial direction.

[0009] The mounting platform has a mounting hole connected to the cover plate along an axial direction; and / or the connecting platform has a mounting hole connected to the cover plate along a radial direction.

[0010] The ear body has docking surfaces for docking with the cover plate on both sides along the radial direction, wherein one docking surface is hingedly connected to the cover plate by a hinge, and the other docking surface is fixedly connected to the cover plate by bolts.

[0011] The first end is hingedly connected to the front mounting seat of the leaf spring through the hinge, and is connected to the frame through the front mounting seat of the leaf spring; the second end is connected to the lifting ear through the hinge, and the lifting ear is hingedly connected to the rear mounting seat of the leaf spring, and is connected to the frame through the rear mounting seat of the leaf spring.

[0012] The leaf spring connection structure also includes a second leaf spring, which has a first connecting end that matches the first end and a second connecting end that matches the second end; the first connecting end is connected to the first end through a first clamp, and the second connecting end is connected to the second end through a second clamp.

[0013] The leaf spring connection structure further includes a limit block, and the limit block is fastened to the first leaf spring and the second leaf spring through the locking mechanism.

[0014] The locking mechanism includes a central bolt and a central nut; the central bolt passes through the first leaf spring and the second leaf spring and connects the limit block to the bottom of the second leaf spring through the central nut.

[0015] The middle parts of the first leaf spring and the second leaf spring are in an arc-shaped structure, and the curvature of the first leaf spring is smaller than that of the second leaf spring.

[0016] A rubber gasket for shock absorption is also connected between the first leaf spring and the second leaf spring.

[0017] Due to the adoption of the above technical solution, the beneficial effects achieved by the utility model are as follows:

[0018] 1. A leaf spring connection structure, comprising a first leaf spring, wherein the ends of the first end and the second end of the first leaf spring in the extension direction are respectively reversely wound to form a winding ear; the winding ear comprises a winding ear body and a cover plate at least partially detachably connected to the winding ear body, a receiving cavity for connecting a hinge is formed between the winding ear body and the cover plate, and the first end and the second end are connected to a vehicle frame through the hinge. The winding ears are arranged at both ends of the first leaf spring, so that a receiving cavity with a hinge installed can be formed inside the winding ears, so that the first end and the second end of the first leaf spring can be connected to the vehicle frame through the hinge; by setting the winding ear as a winding ear body and a cover plate detachably connected, the cover plate can be separated from the winding ear body, so that the hinge installed in the receiving cavity of the winding ear can be taken out and replaced in time when it is damaged, and it is not necessary to remove the entire first leaf spring or even the leaf spring connection structure from the vehicle frame when the hinge is damaged, and only the damaged hinge needs to be removed separately, thereby saving costs and prolonging the service life of the first leaf spring.

[0019] 2. As a preferred embodiment of the utility model, the interior of the ear body has a hollow cavity, one end of the ear body along the axial direction has a notch, the end of the ear body away from the notch forms a mounting platform for mounting the cover plate, and the end of the ear body close to the notch forms a connecting platform for docking the cover plate between the cavity and both sides along the radial direction. By providing the ear body with a notch, an installation position can be reserved for the cover plate, which facilitates the installation of the cover plate at the position of the notch and docking with the ear body. By providing connecting platforms on both sides of the ear body in the radial direction, the docking of the cover plate is achieved. The connecting platforms can limit the position of the cover plate along the radial direction of the ear body. By providing a mounting platform on the ear body, the mounting platform can limit the position of the cover plate along the axial direction of the ear body, thereby fixing the cover plate in the ear body.

[0020] 3. As a preferred embodiment of the utility model, the mounting platform has a mounting hole connected to the cover plate in the axial direction; and / or the connecting platform has a mounting hole connected to the cover plate in the radial direction. In order to achieve a fixed connection between the cover plate and the ear body, mounting holes distributed along the axial direction of the ear body can be provided in the mounting platform, and the mounting holes can be threaded holes. When in use, the screws are passed from one side of the cover plate through the mounting holes of the ear body to lock the cover plate to the ear body. Mounting holes distributed along the radial direction can also be provided on the connecting platform, and the mounting holes can be threaded holes. When in use, the screws are passed from one side of the cover plate through the mounting holes of the ear body to lock the cover plate to the ear body. It is worth noting that, in order to facilitate installation, when the mounting holes distributed along the radial direction are provided on the connecting platform, a through hole needs to be opened at the position of the corresponding mounting hole of the cover plate, and a countersunk seat is provided at one end of the through hole facing outward, so that the screw head part of the screw inserted into the through hole abuts against the end surface of the countersunk seat.

[0021] 4. As a preferred embodiment of the utility model, the two sides of the ear body along the radial direction respectively have docking surfaces for docking with the cover plate, wherein one side of the docking surface is hingedly connected to the cover plate by a hinge, and the other side of the docking surface is fixedly connected to the cover plate by bolts. In addition to screwing the cover plate to the ear body, the cover plate and the ear body can also be set as a hinged connection, without completely removing the cover plate from the ear body, only one side of the bolts need to be removed, and the cover plate is opened along one side of the ear body, so as to realize the rapid removal and replacement of the hinged parts, reduce the removal process between the cover plate and the ear body, and avoid the docking deviation between the cover plate and the ear body.

[0022] 5. As a preferred embodiment of the utility model, the middle parts of the first leaf spring and the second leaf spring are in an arc-shaped structure, and the curvature of the first leaf spring is smaller than that of the second leaf spring. Since the first leaf spring is located above the second leaf spring, the curvature of the arc-shaped structure of the first leaf spring needs to be smaller than that of the arc-shaped structure of the second leaf spring, so that the second leaf spring located outside the first leaf spring can wrap the first leaf spring. By providing two layers of leaf springs, the strength of the steel leaf spring connection structure is improved, and the service life of the entire steel leaf spring connection structure is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0024] Figure 1This is a schematic diagram of the main structure of a leaf spring connection structure in one embodiment of the utility model;

[0025] Figure 2 It is a schematic diagram of the ear structure of a leaf spring connection structure in one embodiment of the utility model.

[0026] In the figure,

[0027] 1. leaf spring front mounting seat, 2. clamp, 3. first leaf spring, 4. second leaf spring, 5. locking mechanism, 6. lifting ear, 7. leaf spring rear mounting seat, 8. hinge, 9. cover plate, 10. coil ear body, 11. mounting hole. DETAILED DESCRIPTION

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0029] In addition, in the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "implementation method", "example", "one embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0032] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in the form of examples in conjunction with the accompanying drawings.

[0033] The utility model relates to a leaf spring connection structure, such as Figure 1-2 As shown, it includes a first leaf spring 3, and the end portions of the first end and the second end in the extension direction of the first leaf spring 3 are respectively reversely wound to form a coil ear; the coil ear includes a coil ear body 10 and a cover plate 9 which is at least partially detachably connected to the coil ear body 10, and a receiving cavity for connecting a hinge 8 is formed between the coil ear body 10 and the cover plate 9, and the first end and the second end are connected to the frame through the hinge 8.

[0034] It is worth noting that the hinge 8 mentioned in the present application is a movable connection method, which is designed to provide a specific rotation capability to the hinged part. It includes but is not limited to a ball hinge connection structure, and may also include a bearing hinge, a butt hinge, a ball hinge, etc., which are all common hinges. The present application preferably adopts a hinged method to achieve rotation.

[0035] It is worth noting that the ear is a hollow spherical structure formed by the end of the first leaf spring 3 curling back inward when it extends outward, and openings connected to the outside are formed at both ends of the ear along the direction perpendicular to the extension direction of the first leaf spring 3, and the hinge 8 can be installed inside the ear and the two ends of the hinge 8 can extend through the opening to facilitate connection with the frame.

[0036] When the vehicle is driving in complex working conditions, the body will be subjected to lateral loads, causing the steel leaf spring to be torsionally deformed. At this time, the leaf spring is deflected, and the first leaf spring 3, under the action of the hinge 8, adaptively changes with the lateral load of the body, so that the force direction of the leaf spring is always perpendicular to the upper surface of the leaf spring, effectively improving the torsional deformation of the leaf spring under the lateral load, thereby ensuring that the leaf spring connection is not affected by the lateral alternating load and improving driving safety.

[0037] Specifically, grooves are provided on the surface of the ball joint 8 for lubrication between the ball joint 8 and the inner arc surface of the accommodating cavity of the coil ear of the first leaf spring 3, which can reduce the wear of the ball joint 8 and increase the service life of the overall leaf spring structure.

[0038] The first end of the first leaf spring 3 serves as the front end of the first leaf spring 3, and the second end of the first leaf spring 3 serves as the rear end of the first leaf spring 3. A ball joint connector is installed in the first end and the second end, and the ball joint connector includes a rotating spherical part and a ball rod symmetrically arranged in the radial direction and connected to the rotating spherical part; the ball rod extends out of the coiled ear at the first end and the coiled ear at the second end, the ball rod at the first end is fixedly connected to the front leaf spring mounting seat 1, respectively, and the ball rod at the second end is rotationally connected to the end of the lifting ear 6 facing the first leaf spring 3, and the end of the lifting ear 6 away from the first leaf spring 3 is rotationally connected to the rear leaf spring mounting seat 7, and the front leaf spring mounting seat 1 and the rear leaf spring mounting seat 7 are respectively fixedly installed on the frame, thereby realizing the rotational connection of the first end and the second end of the first leaf spring 3 to the frame.

[0039] Both ends of the first leaf spring 3 are provided with wound ears, the purpose of which is to form a accommodating cavity with an installation hinge 8 inside the ear, so that the first end and the second end of the first leaf spring 3 can be connected to the frame through the hinge 8; by providing the ear with a detachably connected ear body 10 and a cover plate 9, the cover plate 9 can be separated from the ear body 10, so that the hinge 8 installed in the accommodating cavity of the ear can be removed and replaced in time when it is damaged. There is no need to remove the entire first leaf spring 3 or even the leaf spring connection structure from the frame when the hinge 8 is damaged. Only the damaged hinge 8 needs to be removed separately, thereby saving costs and increasing the service life of the first leaf spring 3.

[0040] The structural design of the curled ears is not limited to the structure of the present application, and any one of the following implementations may be adopted:

[0041] Implementation method 1: Figure 2 As shown, the interior of the ear body 10 has a hollow cavity, one end of the ear body 10 along the axial direction has a notch, the end of the ear body 10 away from the notch forms a mounting platform for mounting the cover plate 9, and the end of the ear body 10 close to the notch forms a connecting platform for docking the cover plate 9 between the two sides of the cavity along the radial direction.

[0042] By providing the ear body 10 with a notch, an installation position can be reserved for the cover plate 9, so that the cover plate 9 can be installed at the notch to dock with the ear body 10. The docking of the cover plate 9 is achieved by providing connecting platforms on both sides of the ear body 10 in the radial direction. The connecting platforms can limit the cover plate 9 along the radial direction of the ear body 10. By providing a mounting platform on the ear body 10, the mounting platform can limit the cover plate 9 along the axial direction of the ear body 10, thereby fixing the cover plate 9 in the ear body 10.

[0043] In this embodiment, the mounting platform has a mounting hole 11 connected to the cover plate 9 in the axial direction; and / or the connecting platform has a mounting hole 11 connected to the cover plate 9 in the radial direction. Specifically:

[0044] Embodiment 1: The mounting platform has a mounting hole 11 connected to the cover plate 9 along the axial direction.

[0045] like Figure 2 As shown, in order to achieve a fixed connection between the cover plate 9 and the ear body 10, mounting holes 11 distributed along the axial direction of the ear body 10 can be provided in the mounting platform. The mounting holes 11 can be threaded holes. When in use, screws are passed through the mounting holes 11 of the ear body 10 from one side of the cover plate 9 to lock the cover plate 9 to the ear body 10.

[0046] Embodiment 2: The connecting platform has mounting holes 11 connected to the cover plate 9 in the radial direction. The connecting platform may also be provided with mounting holes 11 distributed in the radial direction, and the mounting holes 11 may be threaded holes. When in use, a screw is passed through the mounting holes 11 of the ear body 10 from one side of the cover plate 9 to lock and connect the cover plate 9 to the ear body 10. It is worth noting that, in order to facilitate installation, when the mounting holes 11 distributed in the radial direction are provided on the connecting platform, a through hole is required to be opened at the position corresponding to the mounting hole 11 of the cover plate 9, and a countersunk seat is provided at one end of the through hole facing outward, so that the screw head portion of the screw inserted into the through hole abuts against the end surface of the countersunk seat.

[0047] Embodiment 3: The mounting platform has a mounting hole 11 connected to the cover plate 9 along the axial direction; and the connecting platform has a mounting hole 11 connected to the cover plate 9 along the radial direction.

[0048] Embodiment 2: The ear body 10 has docking surfaces on both sides along the radial direction for docking with the cover plate 9, wherein one docking surface is hingedly connected to the cover plate 9 by a hinge, and the other docking surface is fixedly connected to the cover plate 9 by bolts.

[0049] In addition to connecting the cover plate 9 and the ear body 10 with screws, the cover plate 9 and the ear body 10 can also be set as a hinged connection. There is no need to completely remove the cover plate 9 from the ear body 10. Only one side of the bolts needs to be removed, and the cover plate 9 is opened along one side of the ear body 10. This can achieve quick removal and replacement of the hinge 8, reduce the removal process between the cover plate 9 and the ear body 10, and avoid docking deviation between the cover plate 9 and the ear body 10.

[0050] As a preferred embodiment, the first end is hingedly connected to the leaf spring front mounting seat 1 through the hinge 8, and is connected to the frame through the leaf spring front mounting seat 1; the second end is connected to the lifting ear 6 through the hinge 8, the lifting ear 6 is hingedly connected to the leaf spring rear mounting seat 7, and is connected to the frame through the leaf spring rear mounting seat 7.

[0051] like Figure 1 As shown, the leaf spring front mounting seat 1 has three mounting ends, wherein the side facing the frame has two first mounting ends and a second mounting end connected to the frame and distributed in parallel in the horizontal direction, and the side facing the first end of the leaf spring front mounting seat 1 has a third mounting end connected to the hinge 8 in the first end, and the ball rods of the hinge 8 are rotatably connected to the third end respectively; in the same way, the side facing the second end of the leaf spring rear mounting seat 7 is rotatably connected to the lifting ear 6 through a rotating shaft, and the lifting ear 6 is rotatably connected through the ball rod of the hinge 8 at the second end.

[0052] As a preferred embodiment, the leaf spring connection structure further includes a second leaf spring 4, the second leaf spring 4 having a first connecting end matching with the first end and a second connecting end matching with the second end; the first connecting end is connected to the first end via a first clamp 2, and the second connecting end is connected to the second end via a second clamp 2.

[0053] The first connecting end and the second connecting end of the second leaf spring 4 are both arc-shaped structures, and the arc-shaped structure of the second leaf spring 4 is respectively adapted to the arc-shaped structure of the curling ear at the first end and the arc-shaped structure of the curling ear at the second end, so that the first connecting end of the second leaf spring 4 can wrap the first end, and the second connecting end of the second leaf spring 4 can wrap the second end.

[0054] As a preferred implementation, the leaf spring connection structure further includes a limit block, and the limit block is fastened to the first leaf spring 3 and the second leaf spring 4 via the locking mechanism 5 .

[0055] The middle positions of the first leaf spring 3 and the second leaf spring 4 can be mounted on the vehicle frame through the locking mechanism 5 .

[0056] The limit block can be a block-shaped structure, the purpose of which is to clamp the first leaf spring 3 and the second leaf spring 4 to prevent the middle parts of the first leaf spring 3 and the second leaf spring 4 from separating under the action of external impact force, thereby increasing the friction between the first leaf spring 3 and the second leaf spring 4. The limit block is located on the side of the second leaf spring 4 away from the first leaf spring 3, and the limit block is locked and connected to the first leaf spring 3 and the second leaf spring 4 through a limiting mechanism.

[0057] As a preferred embodiment, the locking mechanism 5 includes a center bolt and a center nut; the center bolt passes through the first leaf spring 3 and the second leaf spring 4 and connects the limit block to the bottom of the second leaf spring 4 through the center nut.

[0058] like Figure 1 As shown, the limit block is located at the bottom of the second leaf spring 4, and the locking mechanism 5 includes a center bolt and a center nut. Specifically, the first leaf spring 3 and the second leaf spring 4 have corresponding through holes for installing the center bolt. When in use, the limit block is placed correspondingly below the second leaf spring 4, and the center bolt passes through the through holes on the second leaf spring 4 and the first leaf spring 3 from top to bottom at one time. The center bolt extending out of the second leaf spring 4 is locked by the center nut to achieve a locking connection between the limit block, the first leaf spring 3 and the second leaf spring 4, and can be installed on the frame through the center bolt to achieve the installation of the middle parts of the first leaf spring 3 and the second leaf spring 4 on the frame through the locking mechanism 5.

[0059] As a preferred implementation, the middle parts of the first leaf spring 3 and the second leaf spring 4 are arc-shaped structures, and the curvature of the first leaf spring 3 is smaller than that of the second leaf spring 4 .

[0060] Since the first leaf spring 3 is located above the second leaf spring 4, the curvature of the arc-shaped structure of the first leaf spring 3 needs to be smaller than the curvature of the arc-shaped structure of the second leaf spring 4, so that the second leaf spring 4 is located on the outside of the first leaf spring 3 and can wrap the first leaf spring 3. By arranging two layers of leaf springs, the strength of the steel leaf spring connection structure is improved, and the service life of the entire steel leaf spring connection structure is improved.

[0061] As a preferred implementation, a rubber gasket for shock absorption is connected between the first leaf spring 3 and the second leaf spring 4 .

[0062] There are metal pins on both sides of the rubber gasket; the rubber gasket is made of 2mm-3mm steel plate and rubber vulcanized; the purpose is to reduce the wear between the first leaf spring 3 and the second leaf spring 4, and the metal pins can prevent the first leaf spring 3 and the second leaf spring 4 from moving forward and backward and misaligning the leaves.

[0063] The parts not described in the present invention can be realized by adopting or drawing on the existing technology.

[0064] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0065] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A leaf spring connection structure, characterized in that: It includes a first leaf spring, and the end portions of the first end and the second end in the extension direction of the first leaf spring are respectively reversely wound to form a coil ear; the coil ear includes a coil ear body and a cover plate that is at least partially detachably connected to the coil ear body, and a receiving cavity for connecting a hinge is formed between the coil ear body and the cover plate, and the first end and the second end are connected to the frame through the hinge.

2. A leaf spring connection structure according to claim 1, characterized in that: The interior of the ear body has a hollow cavity, one end of the ear body along the axial direction has a notch, the end of the ear body away from the notch forms a mounting platform for mounting the cover plate, and the end of the ear body close to the notch forms a connecting platform for docking the cover plate between the cavity and both sides along the radial direction.

3. A leaf spring connection structure according to claim 2, characterized in that: The mounting platform has a mounting hole connected to the cover plate along an axial direction; and / or the connecting platform has a mounting hole connected to the cover plate along a radial direction.

4. A leaf spring connection structure according to claim 1, characterized in that: The ear body has docking surfaces for docking with the cover plate on both sides along the radial direction, wherein one docking surface is hingedly connected to the cover plate by a hinge, and the other docking surface is fixedly connected to the cover plate by bolts.

5. The leaf spring connection structure according to claim 1, characterized in that: The first end is hingedly connected to the front mounting seat of the leaf spring through the hinge, and is connected to the frame through the front mounting seat of the leaf spring; the second end is connected to the lifting ear through the hinge, and the lifting ear is hingedly connected to the rear mounting seat of the leaf spring, and is connected to the frame through the rear mounting seat of the leaf spring.

6. A leaf spring connection structure according to claim 1, characterized in that: It also includes a second leaf spring, which has a first connecting end that matches the first end and a second connecting end that matches the second end; the first connecting end is connected to the first end through a first clamp, and the second connecting end is connected to the second end through a second clamp.

7. A leaf spring connection structure according to claim 6, characterized in that: It also includes a limit block, which is fastened to the first leaf spring and the second leaf spring through a locking mechanism.

8. A leaf spring connection structure according to claim 7, characterized in that: The locking mechanism includes a central bolt and a central nut; the central bolt passes through the first leaf spring and the second leaf spring and connects the limit block to the bottom of the second leaf spring through the central nut.

9. The leaf spring connection structure according to claim 6, characterized in that: The middle parts of the first leaf spring and the second leaf spring are in an arc-shaped structure, and the curvature of the first leaf spring is smaller than that of the second leaf spring.

10. The leaf spring connection structure according to claim 6, characterized in that: A rubber gasket for shock absorption is also connected between the first leaf spring and the second leaf spring.

Images