Steel plate spring, suspension system and vehicle

Abstract

The utility model discloses a steel plate spring, a suspension system and a vehicle, and belongs to the technical field of vehicles. The steel plate spring comprises a front connecting part, a rear connecting part and a plate spring body part, the front connecting part is suitable for being connected with a frame, the rear connecting part is suitable for being connected with the frame, the plate spring body part is connected between the front connecting part and the rear connecting part, the plate spring body part is suitable for being connected with an axle, and the front connecting part is provided with a bent section bent upwards so that the plate spring body part can incline. The end, connected with the front connecting part, of the plate spring body part is higher than the end, connected with the rear connecting part, of the plate spring body part. Therefore, the bending section which is bent upwards is constructed on the front connecting part of the steel plate spring, so that the plate spring body part is inclined with the front part higher than the rear part, inclined iron for compensating the caster angle gamma of the main pin does not need to be arranged at the connecting part of the axle and the plate spring body part, the assembly difficulty is reduced, and the lightweight design of a vehicle is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and in particular to a leaf spring, a suspension system and a vehicle. Background Art

[0002] In the related art, for vehicles with leaf spring suspension, a bevel iron is usually required to be set at the connection position between the axle and the leaf spring to achieve a preset wheel kingpin caster angle. However, the bevel iron increases the weight of the entire vehicle, which is not conducive to the lightweight design of the vehicle. Utility Model Content

[0003] The present invention aims to solve at least one of the above-mentioned technical problems in the prior art to a certain extent. To this end, the present invention provides a leaf spring that does not require an inclined iron at its connection with the axle to achieve a lightweight design.

[0004] The utility model also provides a suspension system with the leaf spring.

[0005] The utility model also provides a vehicle with the suspension system.

[0006] According to the leaf spring of an embodiment of the present invention, the leaf spring includes: a front connecting portion, which is suitable for being connected to a vehicle frame; a rear connecting portion, which is suitable for being connected to a vehicle frame; a leaf spring body, which is connected between the front connecting portion and the rear connecting portion, and is suitable for being connected to a vehicle axle; wherein the front connecting portion has a bending section that bends upward to tilt the leaf spring body, and an end of the leaf spring body connected to the front connecting portion is higher than an end of the leaf spring body connected to the rear connecting portion.

[0007] According to the leaf spring of the embodiment of the present invention, the front connecting portion of the leaf spring is constructed with a bent section that bends upward so that the leaf spring body is tilted higher at the front and lower at the rear. The connection between the axle and the leaf spring body does not need to be equipped with an inclined iron to compensate for the kingpin castor angle γ, which is conducive to reducing the difficulty of assembly and realizing a lightweight design of the vehicle.

[0008] According to some embodiments of the present invention, the bending section is constructed as a stepped structure, and the angle of the bending section at the bending point is α, which satisfies the relationship: 100°≤α≤170°.

[0009] According to some embodiments of the present invention, the bending section forms an arc-shaped transition fillet at the bending point.

[0010] According to some embodiments of the present invention, there are one or more bending segments.

[0011] According to another embodiment of the present invention, the suspension system includes: a leaf spring, which is the leaf spring mentioned above; a first bracket, which is suitable for being fixedly connected to the frame, and the front connecting part is rotatably connected to the first bracket; a second bracket, which is suitable for being fixedly connected to the frame; a lifting ear, one end of the lifting ear is rotatably connected to the second bracket, and the other end of the lifting ear is rotatably connected to the rear connecting part; and an axle connecting member, which is suitable for fixing the axle to the leaf spring body.

[0012] According to the suspension system of an embodiment of the present invention, the front connecting portion of the leaf spring is configured with an upwardly bent section so that the leaf spring body is tilted higher at the front and lower at the rear. As a result, the connection between the axle and the leaf spring body does not need to be provided with an inclined iron for compensating for the kingpin caster angle γ, thereby reducing the difficulty of assembly and achieving a lightweight design of the vehicle.

[0013] According to some embodiments of the present invention, the inclination angle of the leaf spring body relative to the horizontal plane is β, and the caster angle of the wheel connected to the axle is γ, satisfying the relationship: 4°≤β≤7°, β=γ.

[0014] According to some embodiments of the present invention, the angle β further satisfies the relationship: β=5.5°.

[0015] According to some embodiments of the present invention, the first bracket and the second bracket have the same structure and size.

[0016] According to some embodiments of the present invention, the suspension system further includes: a shock absorber, one end of the shock absorber is adapted to be connected to the vehicle frame, and the other end of the shock absorber is connected to the leaf spring body.

[0017] A vehicle according to another embodiment of the present invention includes the above-mentioned suspension system.

[0018] According to the vehicle of the embodiment of the present invention, the front connecting portion of the leaf spring is constructed with an upwardly bent section so that the leaf spring body is tilted higher at the front and lower at the rear. The connection between the axle and the leaf spring body does not need to be provided with an inclined iron to compensate for the kingpin castor angle γ, which is conducive to reducing the difficulty of assembly and realizing a lightweight design of the vehicle.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a vehicle according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] Front connecting portion 1; bending section 11; transition fillet 111; front connecting portion body 12;

[0023] rear connecting portion 2; leaf spring body portion 3;

[0024] Leaf spring 10;

[0025] First bracket 20; first mounting hole 201;

[0026] Second bracket 30; second mounting hole 301;

[0027] Lifting eye 40; axle connecting piece 50;

[0028] Suspension system 100 ; frame 200 ; vehicle 1000 . DETAILED DESCRIPTION

[0029] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "length", "up", "down", "front", "back", "vertical", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They 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. Therefore, they cannot be understood as limitations on the present invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or mutual communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0033] The leaf spring 10 , the suspension system 100 , and the vehicle 1000 according to the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] Reference Figure 1 As shown, the leaf spring 10 according to an embodiment of the present invention includes: a front connecting part 1, a rear connecting part 2 and a leaf spring body 3, the front connecting part 1 is suitable for being connected to the vehicle frame 200, the rear connecting part 2 is suitable for being connected to the vehicle frame 200, the leaf spring body 3 is connected between the front connecting part 1 and the rear connecting part 2, and the leaf spring body 3 is suitable for being connected to the vehicle axle, wherein the front connecting part 1 has a bending section 11 bent upward to tilt the leaf spring body 3, and the end of the leaf spring body 3 connected to the front connecting part 1 is higher than the end of the leaf spring body 3 connected to the rear connecting part 2.

[0035] Among them, the front connecting part 1 and the rear connecting part 2 of the leaf spring 10 can both be connected to the vehicle frame 200, and the leaf spring body 3 of the leaf spring 10 is connected between the front connecting part 1 and the rear connecting part 2. The front connecting part 1 has a bending section 11 that bends upward, so that the end of the leaf spring body 3 connected to the front connecting part 1 is higher than the end of the leaf spring body 3 connected to the rear connecting part 2. That is to say, the leaf spring body 3 is inclined higher in the front and lower in the back. Therefore, by setting the bending section 11, the inclination angle β of the leaf spring body 3 relative to the horizontal plane can be increased. When the axle is connected to the leaf spring body 3, there is no need to set an inclined iron at the connection to compensate for the kingpin castor angle γ, which is conducive to reducing the difficulty of assembly and reducing the weight of the entire vehicle.

[0036] The leaf spring body 3 can be connected to the axle through a U-shaped bolt, and the leaf spring body 3 can also be welded to the axle. The leaf spring body 3 can absorb the vibration impact transmitted from the axle through elastic deformation. The leaf spring body 3 can transmit various forces and moments between the wheel and the frame 200 to play a role in buffering and vibration reduction, so as to ensure the stability and safety of the car during driving.

[0037] In the above embodiment, the front connecting portion 1 of the leaf spring 10 is configured with an upwardly bent section 11 so that the leaf spring main body 3 is tilted higher at the front and lower at the rear. The connection between the axle and the leaf spring main body 3 does not require an inclined iron to compensate for the kingpin castor angle γ, thereby reducing the difficulty of assembly and achieving a lightweight design of the vehicle 1000.

[0038] In some embodiments of the present invention, Figure 1 As shown, the bending section 11 is constructed as a stepped structure, and the angle of the bending section 11 at the bending position is α, which satisfies the relationship: 100°≤α≤170°.

[0039] Among them, the front connecting part 1 can include a front connecting part body 12 and a bending section 11. The front connecting part body 12 is suitable for being connected to the vehicle frame 200. The bending section 11 is connected between the front connecting part body 12 and the leaf spring body part 3. The bending section 11 can be constructed as a "J"-shaped step to increase the height of the front end of the leaf spring body part 3, so that the leaf spring body part 3 is tilted higher in the front and lower in the back, so as to increase the inclination angle of the leaf spring body part 3, thereby compensating for the kingpin castor angle γ, so that the kingpin castor angle γ can reach a preset value.

[0040] The angle of the bending section 11 at the bending point can be α, and α can satisfy the relationship: 100°≤α≤170°, that is, α can be any value between 100° and 170°, for example, α can be 100°, 130°, 150°, 170°, etc. When α is less than 100°, the bending amplitude is too large and the reliability is poor. When α is greater than 170°, the bending section 11 is large in the front-to-back direction and is easy to interfere with other components. By designing the angle of the bending section 11 at the bending point to α as: 100°≤α≤170°, the bending amplitude of the bending section 11 can be reduced, the structural strength and reliability of the bending section 11 can be improved, and the size of the bending section 11 in the front-to-back direction can be reduced, reducing the risk of interference between the leaf spring 10 and other components, and increasing the reliability and safety of the leaf spring 10.

[0041] In some embodiments of the present invention, Figure 1 As shown, the bending section 11 forms an arc-shaped transition fillet 111 at the bending portion.

[0042] Among them, the arc-shaped transition fillet 111 of the bending section 11 can be connected to the front connecting part body 12. The arc-shaped transition fillet 111 can reduce the stress concentration at the bending point, and can reduce the degree of strength reduction caused by the steel plate front connecting part 1 being constructed with the upward-bent bending section 11, so that the steel plate spring 10 can have better structural strength and rigidity, and can reduce the risk of deformation or even fracture at the bending point, so as to improve the reliability and safety of the steel plate spring 10.

[0043] In some embodiments of the present invention, the number of the bending segments 11 is one or more.

[0044] The number of the bent segments 11 may be one or more. When only one bent segment 11 is required to achieve the preset castor angle γ, only one bent segment 11 is required. This arrangement can reduce the difficulty in designing and manufacturing the bent segment 11, thereby improving the efficiency of manufacturing the leaf spring 10. When multiple bent segments 11 are required to achieve the preset castor angle γ, multiple bent segments 11 can be provided as needed, and the multiple bent segments 11 can be connected in sequence. This arrangement can shorten the length of each bent segment 11, reduce the space occupied by the bent segments 11, reduce the risk of interference between the leaf spring 10 and other components, ensure a reliable vibration reduction effect of the leaf spring 10, and thus improve the reliability of the leaf spring 10 and its use.

[0045] According to another embodiment of the present invention, the suspension system 100 is as follows: Figure 1 As shown, the suspension system 100 includes: a leaf spring 10, a first bracket 20, a second bracket 30, a lifting eye 40 and an axle connecting member 50. The leaf spring 10 is the leaf spring 10 of the above embodiment. The first bracket 20 is suitable for being fixedly connected to the frame 200. The front connecting part 1 is rotatably connected to the first bracket 20. The second bracket 30 is suitable for being fixedly connected to the frame 200. One end of the lifting eye 40 is rotatably connected to the second bracket 30. The other end of the lifting eye 40 is rotatably connected to the rear connecting part 2. The axle connecting member 50 is suitable for fixing the axle to the leaf spring body 3.

[0046] Among them, the first bracket 20 and the second bracket 30 of the suspension system 100 can be welded or bolted to the frame 200, the first bracket 20 can have a first mounting hole 201, the second bracket 30 can have a second mounting hole 301, the front connecting part 1 can be constructed with a first matching hole, and the first pin can be passed through the first mounting hole 201 and the first matching hole to enable the front connecting part 1 to be rotatably connected to the first bracket 20, the ear 40 of the suspension system 100 can be connected between the second bracket 30 and the rear connecting part 2, and one end of the ear 40 can be constructed with a first connecting hole, and the second pin can be passed through the first matching hole. The second mounting hole 301 and the first connecting hole at one end of the lifting ear 40 are configured so that the lifting ear 40 can be rotatably connected to the second bracket 30. The other end of the lifting ear 40 can be constructed with a second connecting hole, and the rear connecting part 2 can be constructed with a second matching hole. The third pin shaft can be passed through the second connecting hole and the second matching hole of the lifting ear 40 so that the lifting ear 40 can be rotatably connected to the rear connecting part 2. This arrangement can enable the leaf spring 10 to fully elastically deform to absorb and disperse the impact force from the road surface, so that the user of the vehicle 1000 can have a better vehicle experience, while also protecting the vehicle 1000 and reducing the risk of damage to the vehicle 1000.

[0047] The axle connector 50 is used to fix the axle to the leaf spring body 3. The axle connector 50 may include a U-shaped bolt (riding bolt). Through the leaf spring 10 proposed in the present invention, there is no need to set an inclined iron at the connection between the axle and the leaf spring body 3, thereby avoiding the situation where the axle connector 50 is subjected to unbalanced force, extending the service life of the axle connector 50, and increasing the reliability of the suspension system 100.

[0048] By simultaneously providing the lifting lug 40 and the bending section 11 in the suspension system 100, the angle between the lower surface of the leaf spring body 3 and the lower wing surface of the vehicle frame 200 can be increased. In other words, the leaf spring body 3 can be further tilted with the front higher and the rear lower, and the kingpin castor angle γ can be further increased, so that the kingpin castor angle γ of the suspension system 100 can reach a preset value, so that the vehicle 1000 has a better self-aligning torque, thereby further improving the driving stability of the vehicle 1000.

[0049] Leaf springs 10 can be arranged on both sides of the suspension system 100. There is no need to set bevel irons on the leaf springs 10 on both sides of the suspension system 100 to compensate for the kingpin caster angle γ. This arrangement can reduce the weight of the entire vehicle, with a single vehicle weight reduction of about 25 kg, which is conducive to achieving a lightweight design.

[0050] In some embodiments of the present invention, Figure 1 As shown, the inclination angle of the leaf spring body 3 relative to the horizontal plane is β, and the caster angle of the wheel connected to the axle is γ, which satisfies the relationship: 4°≤β≤7°, β=γ.

[0051] The inclination angle β of the leaf spring body relative to the horizontal plane can satisfy the relationship: 4°≤β≤7°, that is, β can be any value between 4° and 7°, for example, β can be 4°, 5.5°, 7°, etc.

[0052] The caster angle γ is the angle between the kingpin of the wheel and the vertical direction. In the prior art, the caster angle γ can be compensated by providing an inclined iron, so that the caster angle γ reaches the designed value. The present invention increases the height of the front end of the leaf spring body 3 by providing an upwardly bent bent section 11 at the front connecting portion 1, so that the leaf spring body 3 is tilted higher at the front and lower at the rear. The inclination angle of the leaf spring body 3 is β, and γ and β satisfy the relationship: β=γ. The present invention does not need to provide an inclined iron by providing the upwardly bent bent section 11, and can achieve the preset caster angle γ, thereby reducing the weight of the vehicle 1000 and achieving the purpose of lightweight design.

[0053] In some embodiments of the present invention, Figure 1 As shown, β further satisfies the relationship: β = 5.5°.

[0054] Among them, β can further satisfy the relationship: β = 5.5°. This setting can enable the vehicle 1000 to reach the preset kingpin castor angle γ, and can enable the vehicle 1000 to have a larger righting torque to maintain the stability of the vehicle 1000 in straight driving, thereby better improving the driving stability of the vehicle 1000 and enhancing the user's car experience.

[0055] In some embodiments of the present invention, Figure 1 As shown, the first bracket 20 and the second bracket 30 have the same structure and size.

[0056] Among them, the first bracket 20 and the second bracket 30 can be constructed as the same parts, and the first bracket 20 and the second bracket 30 are provided on both sides of the vehicle 1000. All brackets can be constructed as the same parts to reduce the difficulty of designing and manufacturing the first bracket 20 and the second bracket 30, so that the first bracket 20 and the second bracket 30 can be replaced with each other, which can save the cost of designing, manufacturing and repairing the first bracket 20 and the second bracket 30. Moreover, the first bracket 20 and the second bracket 30 of the suspension system 100 on the left side of the vehicle 1000 are the same size and shape as the first bracket 20 and the second bracket 30 of the suspension system 1000 on the right side of the vehicle 1000. The four brackets on the front, back, left and right sides of the vehicle 1000 are all the same structural parts. Only one mold is designed to manufacture the first bracket 20 and the second bracket 30 that can be used on both sides of the vehicle 1000, which can save the mold development cost.

[0057] In some embodiments of the present invention, the suspension system 100 further includes a shock absorber, one end of which is adapted to be connected to the vehicle frame 200 , and the other end of which is connected to the leaf spring body 3 .

[0058] Among them, one end of the shock absorber of the suspension system 100 can be connected to the frame 200, and the other end of the shock absorber can be connected to the leaf spring body 3 through the axle connector 50. The leaf spring 10 can be used to absorb impact force, and the shock absorber can be used to suppress the vibration of the leaf spring 10 and convert the vibration energy into heat energy. The leaf spring 10 and the shock absorber are used in conjunction to reduce the degree of bumps on the vehicle body and the user, can make the vehicle 1000 run more smoothly, and can improve the user's comfort.

[0059] According to an embodiment of the present invention, a vehicle 1000 includes the aforementioned suspension system 100. By configuring the front connecting portion 1 of the leaf spring 10 with an upwardly bent section 11, the leaf spring body 3 is tilted so that the front portion is higher and the rear portion is lower. This eliminates the need for a wedge to compensate for the caster angle γ at the connection between the axle and the leaf spring body 3, thereby reducing assembly complexity and achieving a lightweight design for the vehicle 1000.

[0060] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean 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 present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0061] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A leaf spring, characterized in that: The leaf spring comprises: A front connecting portion (1), the front connecting portion (1) being adapted to be connected to a vehicle frame (200); a rear connecting portion (2), the rear connecting portion (2) being adapted to be connected to a vehicle frame (200); a leaf spring body (3), the leaf spring body (3) being connected between the front connecting portion (1) and the rear connecting portion (2), and the leaf spring body (3) being suitable for being connected to a vehicle axle; The front connecting portion (1) has an upwardly bent section (11) so as to tilt the leaf spring body (3), and the end of the leaf spring body (3) connected to the front connecting portion (1) is higher than the end of the leaf spring body (3) connected to the rear connecting portion (2).

2. The leaf spring according to claim 1, wherein: The bending section (11) is constructed as a stepped structure, and the angle of the bending section (11) at the bending position is α, which satisfies the relationship: 100°≤α≤170°.

3. The leaf spring according to claim 2, wherein: The bending section (11) forms an arc-shaped transition fillet (111) at the bending position.

4. The leaf spring according to any one of claims 1 to 3, characterized in that: The number of the bending segments (11) is one or more.

5. A suspension system, characterized in that: include: A leaf spring, wherein the leaf spring is a leaf spring according to any one of claims 1 to 4; a first bracket (20), the first bracket (20) being adapted to be fixedly connected to the vehicle frame (200), the front connecting portion (1) being rotatably connected to the first bracket (20); a second bracket (30), the second bracket (30) being adapted to be fixedly connected to the vehicle frame (200); a lifting lug (40), one end of the lifting lug (40) being rotatably connected to the second bracket (30), and the other end of the lifting lug (40) being rotatably connected to the rear connecting portion (2); An axle connector (50) is suitable for fixing the axle to the leaf spring body (3).

6. The suspension system according to claim 5, characterized in that The inclination angle of the leaf spring body (3) relative to the horizontal plane is β, and the caster angle of the wheel connected to the axle is γ, which satisfies the relationship: 4°≤β≤7°, β=γ.

7. The suspension system according to claim 6, characterized in that The β further satisfies the relationship: β=5.5°.

8. The suspension system according to claim 5, wherein: The first bracket (20) and the second bracket (30) have the same structure and size.

9. The suspension system according to claim 5, wherein: The suspension system further comprises a shock absorber, one end of which is adapted to be connected to the vehicle frame (200), and the other end of which is connected to the leaf spring body (3).

10. A vehicle, characterized in that: Comprising a suspension system according to any one of claims 5-9.

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