A suspension system based on a single leaf spring

Abstract

The invention discloses a suspension system based on a single-piece steel leaf spring, and relates to the technical field of steel leaf spring suspension, comprising a vehicle frame; a fixed end bracket and a lifting eye end bracket are provided on the vehicle frame; a steel leaf spring; one end of the steel leaf spring is connected to the fixed end bracket, and the other end is connected to the lifting eye end bracket through a leaf spring lifting eye, and the leaf spring lifting eye and the lifting eye end bracket are hinged to form a hinge point A; and also comprises a hinge structure, the hinge structure is arranged between the fixed end bracket and the lifting eye end bracket, and one end of the hinge structure is hinged to the vehicle frame, and the other end is hinged to the leaf spring lifting eye; when the leaf spring lifting eye is in a normal position, the hinge structure can be configured to be in a bent state; when the leaf spring lifting eye is in an extreme position, the hinge structure can be configured to be in a straightened state; in this scheme, the hinge structure is designed and utilized to limit the leaf spring lifting eye, so as to prevent the leaf spring lifting eye from continuing to swing toward the rear end, so as to ensure that the bridge body does not deviate left and right, and prevent the vehicle from becoming unstable.

Description

Technical Field

[0001] The invention relates to the technical field of steel leaf spring suspensions, in particular to a suspension system based on a single steel leaf spring. Background Art

[0002] The national standard GB30510-2018 "Limits of Fuel Consumption for Heavy Commercial Vehicles" promotes the lightweight development of steel leaf springs, including the fuel consumption limits for commercial vehicles with a maximum design gross mass greater than 3500kg that use gasoline and diesel. At present, most commercial vehicle front suspension systems use steel leaf springs as elastic elements, and the current domestic front steel leaf springs are mainly two-leaf and three-leaf. Therefore, designing a single-leaf front steel leaf spring will be one of the solutions to reduce the vehicle's deadweight. However, the failure of a single-leaf front steel leaf spring is inevitable when the vehicle is driving.

[0003] There are three modes of single-leaf steel leaf spring fracture: 1. Single-leaf steel leaf spring fixed end fracture; 2. Single-leaf steel leaf spring lifting ear end fracture; 3. Single-leaf steel leaf spring center hole fracture.

[0004] China Patent Authorization Announcement No.: CN 213088594 U, discloses "A Single-Leaf Steel Leaf Spring Assembly", which solves the stress concentration problem caused by the center hole and improves the service life.

[0005] However, when the vehicle is driving normally or braking, the single-leaf steel leaf spring assembly will produce significant deformation, and the fracture of the fixed end and the ear end will seriously affect driving safety. Therefore, how to avoid or reduce the impact of the fracture of the single-leaf steel leaf spring is the direction that R&D engineers are constantly researching. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention proposes a suspension system based on a single-piece steel leaf spring. By adopting the suspension system provided by this solution, the instantaneous impact on driving caused by the breakage of the fixed end or the breakage of the ear end can be effectively reduced.

[0007] The specific scheme proposed by the present invention is as follows:

[0008] A suspension system based on a single-piece steel leaf spring, comprising

[0009] The frame is provided with a fixed end bracket and a lifting lug end bracket;

[0010] A steel leaf spring; one end of the steel leaf spring is connected to the fixed end bracket, and the other end is connected to the ear end bracket through a leaf spring ear, and the leaf spring ear and the ear end bracket are hinged to form a hinge point A; and also includes a hinge structure, which is arranged between the fixed end bracket and the ear end bracket, and one end of the hinge structure is hinged to the frame, and the other end is hinged to the leaf spring ear;

[0011] When the leaf spring lifting lug is in a normal position, the hinge structure can be configured to be in a bent state;

[0012] When the leaf spring lifting eye is in the extreme position, the hinge structure can be configured to be in a straightened state.

[0013] Further, the hinge structure includes:

[0014] A first hinge block; hinged to the leaf spring lifting lug; and

[0015] The second articulated block is connected to the vehicle frame via a hinge bracket; the second articulated block is located between the hinge bracket and the first articulated block, and two ends of the second articulated block are respectively articulated to the hinge bracket and the first articulated block.

[0016] Furthermore, a first arm is provided on the leaf spring lifting ear, and the first arm is vertically arranged with the leaf spring lifting ear and protrudes in the direction of the hinge structure;

[0017] The first hinge block is hinged to the first arm to form a hinge point B, and the hinge point B forms a virtual adjustment circle with the hinge point A as the center. When the leaf spring ear is in the extreme position, the tension direction line generated by the hinge structure in a straightened state is just tangent to the virtual adjustment circle.

[0018] Furthermore, the steel leaf spring is hinged with the leaf spring lifting lug to form a hinge point C; a second arm is also provided on the leaf spring lifting lug, and the second arm is located below the hinge point C and protrudes and extends in the direction of the steel leaf spring;

[0019] A receiving shaft is connected between the second arms, and the receiving shaft is configured to support the steel leaf spring when the lifting ear end of the steel leaf spring is broken.

[0020] Furthermore, the second support arm is perpendicular to the leaf spring lifting ear.

[0021] Furthermore, it also includes a bridge body and a shock absorber, the middle part of the steel leaf spring is arranged on the bridge body, the bridge body is connected to the shock absorber, and the shock absorber is arranged on the frame.

[0022] Furthermore, it also includes a stabilizing bar, which is located between the bridge body and the fixed end bracket, one end of the stabilizing bar is connected to the frame, and the other end is connected to the bridge body.

[0023] Furthermore, it also includes a limit block fixed on the frame, and the limit block is located in front of the shock absorber.

[0024] The beneficial effects achieved by adopting this technical solution are:

[0025] 1. In this scheme, a hinge structure is designed to limit the leaf spring lifting ear. Especially when the fixed end of the steel leaf spring is broken, the leaf spring lifting ear rotates to a certain angle toward the rear end under the action of the steel leaf spring, so that the hinge structure is in a straightened state, and an instantaneous upward pulling force is generated on the leaf spring lifting ear to prevent the leaf spring lifting ear from continuing to swing toward the rear end, so as to ensure that the bridge body does not deviate to the left or right and prevent the vehicle from becoming unstable.

[0026] 2. This solution also adopts an innovative design for the leaf spring lifting ear, and sets a second support arm and a receiving shaft, so that when the lifting ear end of the single-leaf steel leaf spring breaks, the receiving shaft can support the broken single-leaf steel leaf spring, control the downward movement position of the broken single-leaf steel leaf spring, and ensure that the broken single-leaf steel leaf spring will not hit the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The diagram of the suspension system with the hinge structure in a bent state.

[0028] Figure 2 The diagram of the suspension system with the hinge structure in a straightened state.

[0029] Figure 3 This is the planar structural diagram of the leaf spring lifting ear.

[0030] Figure 4 This is the force analysis diagram of the hinge structure in the straightened state.

[0031] Figure 5 This is a three-dimensional structural diagram of the leaf spring hanging eye installed on the frame.

[0032] Among them: 10 frame, 20 fixed end bracket, 30 ear end bracket, 40 leaf spring ear, 41 first arm, 42 second arm, 43 supporting shaft, 50 hinge structure, 51 first hinge block, 52 second hinge block, 53 hinge bracket, 61 bridge body, 62 shock absorber, 63 stabilizer bar, 64 limit block, 100 steel leaf spring. DETAILED DESCRIPTION

[0033] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] This embodiment provides a suspension system based on a single-piece steel leaf spring. By utilizing the suspension system, the risk factor caused by the breakage of the fixed end or the lifting ear end of the single-piece steel leaf spring can be effectively reduced, thereby achieving the purpose of improving driving stability.

[0035] In this embodiment, see Figure 1-Figure 2 The provided suspension system includes a frame 10, a fixed-end bracket 20, an ear-end bracket 30, a leaf spring ear 40 and a steel leaf spring 100; wherein the fixed-end bracket 20 and the ear-end bracket 30 are fixed on the frame 10; one end of the steel leaf spring 100 is connected to the fixed-end bracket 20, and the other end is connected to the ear-end bracket 30 through the leaf spring ear 40, and the leaf spring ear 40 and the ear-end bracket 30 are hinged to form a hinge point A.

[0036] In order to reduce the impact of the broken fixed end of the steel leaf spring 100 on stable driving, a hinge structure 50 is also provided on the frame 10 in the present embodiment; the hinge structure 50 here mainly plays a protective role, and it can be understood that the hinge structure 50 is a protective structure. After the fixed end of the steel leaf spring 100 breaks, the hinge structure 50 effectively protects the entire suspension system.

[0037] Specifically, the hinge structure 50 is disposed between the fixed end bracket 20 and the eye end bracket 30, and one end of the hinge structure 50 is hinged to the frame 10, and the other end of the hinge structure 50 is hinged to the leaf spring eye 40; by adopting the above structural design, when the leaf spring eye 40 is in a normal position, the hinge structure 50 can be configured to be in a bent state, such as Figure 1 ; The state here can be understood as a non-working state; however, after the fixed end of the steel leaf spring 100 is broken, the leaf spring ear 40 is rotated to a certain angle toward the rear end under the action of the steel leaf spring 100, so that the hinge structure 50 is in a straightened state, such as Figure 2 The state at this time can be understood as the working state of the hinge structure 50. At this time, after the hinge structure is straightened, the position of the leaf spring ear 40 is the limit position.

[0038] The hinge structure 50 is used to limit the position of the leaf spring ear 40. When the fixed end of the steel leaf spring 100 breaks, the leaf spring ear 40 rotates to a certain angle toward the rear end so that the hinge structure 50 is in a straightened state. The hinge structure 50 generates an instantaneous upward pulling force on the leaf spring ear 40 to prevent the leaf spring ear 40 from continuing to swing toward the rear end, thereby ensuring that the bridge body does not deviate to the left or right and preventing the vehicle from becoming unstable.

[0039] In this solution, the hinge structure 50 mentioned above comprises a first hinge block 51 and a second hinge block 52; wherein the first hinge block 51 is hinged to the leaf spring hanger 40; the second hinge block 52 is connected to the frame 10 through a hinge bracket 53; the second hinge block 52 is located between the hinge bracket 53 and the first hinge block 51, and the two ends of the second hinge block 52 are hingedly connected to the hinge bracket 53 and the first hinge block 51 respectively.

[0040] That is, the hinge structure 50 here is specifically formed by connecting two hingedly connected hinge blocks. Preferably, the first hinge block 51 and the second hinge block 52 have the same structure.

[0041] See also Figure 2-Figure 4 In order to further ensure the protective effect of the hinge structure 50 on the leaf spring ear 40, in this solution, a first arm 41 is provided on the leaf spring ear 40, and the first arm 41 is perpendicularly arranged to the leaf spring ear 40 and protrudes in the direction of the hinge structure 50; and the first hinge block 51 is hinged to the first arm 41 to form a hinge point B, and the hinge point B forms a virtual adjustment circle with the hinge point A as the center. When the leaf spring ear 40 is in the extreme position, the tension direction line generated by the hinge structure 50 in the straightened state is just tangent to the virtual adjustment circle.

[0042] It can be understood that the movement of the hinge point B is a circular motion with the hinge point A as the reference point, but when the hinge structure 50 is straightened, that is, when the first hinge block 51 and the second hinge block 52 form a straight line, a pulling force F will be generated on the first arm 41, and the direction of the pulling force F here is just tangent to the formed virtual adjustment circle.

[0043] That is, by reasonably designing the position and length of the first arm 41, after the fixed end of the steel leaf spring 100 breaks, the instantaneous thrust of the steel leaf spring 100 on the leaf spring ear 40 and the instantaneous tension of the hinge structure 50 on the leaf spring ear 40 can be offset, and the leaf spring ear 40 can be effectively restricted from continuing to swing backward, so as to ensure that the bridge body does not deviate to the left or right, thereby preventing the vehicle from becoming unstable.

[0044] This solution not only provides preventive protection for the fixed end of the steel leaf spring 100 after it breaks, but also provides preventive protection for the ear end of the steel leaf spring 100 after it breaks by further improving the structure of the leaf spring ear 40 .

[0045] For details, see Figure 4-Figure 5 The steel leaf spring 100 is hinged with the leaf spring lifting ear 40 to form a hinge point C; a second arm 42 is also provided on the leaf spring lifting ear 40, and the second arm 42 is located below the hinge point C and protrudes and extends in the direction of the steel leaf spring 100; and a receiving shaft 43 is connected between the second arms 42, and the receiving shaft 43 here is configured to support the steel leaf spring 100 when the lifting ear end of the steel leaf spring 100 is broken.

[0046] It can be understood that a receiving shaft 43 is provided below the lifting ear end of the steel leaf spring 100 to prevent the lifting ear end from breaking. In a specific scenario, if the lifting ear end of the steel leaf spring 100 breaks, the receiving shaft 43 can support the steel leaf spring 100 in time, control the downward movement position of the broken single-piece steel leaf spring, and ensure that the broken single-piece steel leaf spring will not hit the ground.

[0047] Optionally, the second arm 42 here is perpendicular to the leaf spring eye 40 .

[0048] In this embodiment, see Figure 1 , further comprising a bridge body 61 and a shock absorber 62 , the middle portion of the steel leaf spring 100 is disposed on the bridge body 61 , and the bridge body 61 is connected to the shock absorber 62 , and the shock absorber 62 is disposed on the vehicle frame 10 .

[0049] In this embodiment, a stabilizing rod 63 is further included. The stabilizing rod 63 is located between the bridge body 61 and the fixed end bracket 20 . One end of the stabilizing rod 63 is connected to the vehicle frame 10 , and the other end is connected to the bridge body 61 .

[0050] In this embodiment, a limit block 64 fixed on the vehicle frame 10 is further included. The limit block 64 is located in front of the shock absorber 62 .

[0051] In this scheme, a hinge structure is designed and used to limit the leaf spring lifting ear. In particular, when the fixed end of the steel leaf spring breaks, the leaf spring lifting ear rotates to a certain angle toward the rear end under the action of the steel leaf spring, so that the hinge structure is in a straightened state, and an instantaneous upward pulling force is generated on the leaf spring lifting ear, preventing the leaf spring lifting ear from continuing to swing toward the rear end, so as to ensure that the bridge body does not deviate to the left or right and prevent the vehicle from becoming unstable; and by setting a second support arm and a supporting shaft, when the lifting ear end of a single-piece steel leaf spring breaks, the supporting shaft can support the broken single-piece steel leaf spring, control the downward movement position of the broken single-piece steel leaf spring, and ensure that the broken single-piece steel leaf spring does not hit the ground.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A suspension system based on a single leaf spring, comprising: A vehicle frame (10); the vehicle frame (10) is provided with a fixed end bracket (20) and a lifting eye end bracket (30); A steel leaf spring (100); one end of the steel leaf spring (100) is connected to the fixed end bracket (20), and the other end is connected to the ear end bracket (30) via a leaf spring ear (40), and the leaf spring ear (40) and the ear end bracket (30) are hinged to form a hinge point A; characterized in that: It also includes a hinge structure (50), the hinge structure (50) being arranged between the fixed end bracket (20) and the lifting eye end bracket (30), and one end of the hinge structure (50) being hinged to the vehicle frame (10), and the other end being hinged to the leaf spring lifting eye (40); When the leaf spring lifting eye (40) is in a normal position, the hinge structure (50) can be configured to be in a bent state; When the leaf spring lifting eye (40) is in the extreme position, the hinge structure (50) can be configured to be in a straightened state; the hinge structure (50) comprises; A first hinge block (51) is hingedly connected to the leaf spring lifting ear (40); and a second hinge block (52) connected to the vehicle frame (10) via a hinge bracket (53); the second hinge block (52) is located between the hinge bracket (53) and the first hinge block (51), and two ends of the second hinge block (52) are respectively hingedly connected to the hinge bracket (53) and the first hinge block (51); a first support arm (41) is provided on the leaf spring lifting ear (40), and the first support arm (41) is perpendicularly arranged to the leaf spring lifting ear (40) and protrudes in the direction of the hinge structure (50); The first hinge block (51) is hinged to the first support arm (41) to form a hinge point B, and the hinge point B forms a virtual adjustment circle with the hinge point A as the center. When the leaf spring lifting eye (40) is in the extreme position, the tension direction line generated by the hinge structure (50) in a straightened state is exactly tangent to the virtual adjustment circle.

2. A suspension system based on a single leaf spring according to claim 1, characterized in that: The steel leaf spring (100) is hinged to the leaf spring lifting eye (40) to form a hinge point C; a second arm (42) is also provided on the leaf spring lifting eye (40), and the second arm (42) is located below the hinge point C and protrudes and extends in the direction of the steel leaf spring (100); A receiving shaft (43) is connected between the second support arms (42), and the receiving shaft (43) is configured to support the steel leaf spring (100) when the lifting ear end of the steel leaf spring is broken.

3. A suspension system based on a single leaf spring according to claim 2, characterized in that: The second support arm (42) is perpendicular to the leaf spring lifting ear (40).

4. A suspension system based on a single leaf spring according to claim 1, characterized in that: It also includes a bridge body (61) and a shock absorber (62), wherein the middle portion of the steel leaf spring (100) is arranged on the bridge body (61), the bridge body (61) is connected to the shock absorber (62), and the shock absorber (62) is arranged on the vehicle frame (10).

5. A suspension system based on a single leaf spring according to claim 4, characterized in that: It also includes a stabilizing rod (63), the stabilizing rod (63) being located between the bridge body (61) and the fixed end bracket (20), one end of the stabilizing rod (63) being connected to the vehicle frame (10), and the other end of the stabilizing rod (63) being connected to the bridge body (61).

6. A suspension system based on a single leaf spring according to claim 5, characterized in that: It also includes a limit block (64) fixed on the vehicle frame (10), wherein the limit block (64) is located in front of the shock absorber (62).

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