A check block assembly for a hard off-road vehicle

Abstract

The utility model discloses a kind of limiting block assembly for hard off-road vehicle, which belongs to light hard off-road vehicle suspension system accessory technical field.It mainly includes installation bottom plate, limiting main body is fixedly connected on installation bottom plate, the side of limiting main body close to installation bottom plate is equipped with buffer blind hole, damping buffer mechanism for absorbing vibration is equipped on installation bottom plate, installation hole is respectively equipped in the position close to both ends of installation bottom plate.The utility model adds buffer blind hole, to provide additional deformation space, form double buffering with damping buffer mechanism, can effectively weaken the suspension impact load when off-road, avoid impact directly transmitted to vehicle frame, improve driving comfort.The utility model is mainly used for buffering and damping to vehicle suspension.

Description

Technical Field

[0001] This utility model belongs to the technical field of suspension system accessories for lightweight hardcore off-road vehicles, and more specifically, it relates to a limit block assembly for hardcore off-road vehicles. Background Technology

[0002] The suspension limiters in rugged off-road vehicles are crucial components for ensuring vehicle safety. Lightweight rugged off-road vehicle chassis structures generally fall into two categories: front soft axle and rear solid rigid axle, or front and rear solid rigid axles. In both of these configurations, the rear passenger comfort is inferior to that of the front passenger. This is because the front-heavy weight distribution makes the front suspension absorb the load more easily, while rear passengers are closer to the rear wheels, resulting in more direct vibration transmission; furthermore, the high rigidity of the limiters can lead to abrupt changes in ride comfort.

[0003] Meanwhile, current limit blocks generally adopt a structure design of rubber body and metal base, which can achieve basic limit function, but has obvious defects in complex off-road scenarios: 1. Insufficient impact resistance of metal base: The driving environment of hardcore off-road vehicles is relatively complex. Long-term driving on unpaved roads will cause irreversible height loss of the rubber body. At the same time, the metal base is prone to deformation under continuous external impact, which will reduce the conformity between the metal base and the frame mounting surface and generate additional driving noise. 2. Poor reliability of bolted connections: Deformation of the metal base surface will directly lead to abnormal torque in the mounting bolt holes, and the bolts are prone to loosening with vehicle vibration; 3. High safety risks: Loose bolts can cause the limit block to fall off completely, causing the vehicle to lose the last limiting protection barrier of the suspension, resulting in a "metal-on-metal" phenomenon, causing irreversible structural damage to the vehicle's suspension and frame.

[0004] Currently, there is no limit block assembly that can both improve the riding experience of rear passengers and ensure its structural strength and durability. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a limit block assembly for hardcore off-road vehicles. It adds buffer blind holes to provide additional deformation space and forms a double buffer with the damping buffer mechanism, which can effectively reduce the suspension impact load during off-roading, avoid the impact from being directly transmitted to the vehicle frame, and improve driving comfort.

[0006] The aforementioned limiting block assembly for a rugged off-road vehicle includes a mounting base plate, a limiting body fixedly connected to the mounting base plate, a buffer blind hole on the side of the limiting body near the mounting base plate, a damping buffer mechanism for absorbing vibration on the mounting base plate, and mounting holes on the mounting base plate near both ends.

[0007] Preferably, the damping buffer mechanism includes a buffer spring, which is located inside the buffer blind hole, with one end of the buffer spring abutting against the inner end face of the buffer blind hole and the other end of the buffer spring abutting against the mounting base plate.

[0008] Preferably, the limiting body has a buffer groove on the side near the mounting base plate, and the mounting base plate has a buffer boss that matches the buffer groove, with the other end of the buffer spring abutting against the buffer boss.

[0009] Preferably, the buffer boss and the mounting base plate are integrally formed by stamping.

[0010] Preferably, the limiting body is made of NR natural rubber with a hardness of 60-65HA, the mounting base is made of QSTE500TM structural steel, and the buffer spring is made of 65Mn low manganese spring steel.

[0011] Preferably, the damping buffer mechanism includes a first carbon fiber composite layer, a damping layer, and a second carbon fiber composite layer, with the two sides of the damping layer respectively bonded and fixed to the first carbon fiber composite layer and the second carbon fiber composite layer.

[0012] Preferably, both the first carbon fiber composite layer and the second carbon fiber composite layer are made of carbon fiber reinforced resin matrix composite material, and the damping layer is made of hydrogenated nitrile rubber.

[0013] Preferably, the limiting body is made of NR natural rubber with a hardness of 60-65HA.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. A buffer blind hole is added to the limiting body to provide additional deformation space. Together with the damping buffer mechanism, it forms a double buffer, which can effectively reduce the suspension impact load during off-road driving, prevent the impact from being directly transmitted to the frame, and change the buffer stiffness from linear to nonlinear, reducing the abruptness of the connection and improving the driving comfort.

[0015] 2. The damping layer or buffer spring can efficiently absorb high-frequency vibrations, and the three-layer composite structure mounting base plate has high strength and is not easily deformed. The interlayer gaps are eliminated through co-curing to avoid resonance noise. In addition, the buffer blind holes can also disperse the deformation stress of the limiting body, reduce rubber vibration noise, and solve the problem of additional noise caused by the non-fitting surface of the existing structure.

[0016] 3. In this utility model, the NR natural rubber of the limiting body has good elastic recovery and fatigue resistance; the buffer spring has a high elastic limit and is not easy to break; the mounting base plate material is resistant to impact attenuation; the overall components operate under low stress, can adapt to complex off-road environments for a long time, reduce performance degradation caused by material fatigue, and extend the service life of the limiting block assembly. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of Example 1; Figure 2 This is a top view of Embodiment 1; Figure 3 for Figure 2 Sectional view along the AA direction; Figure 4 This is a three-dimensional structural diagram of Example 2; Figure 5 This is a breakdown diagram of Example 2; Figure 6 This is a schematic diagram of the internal structure of Example 2; Figure 7 This is a breakdown diagram of Example 4; Figure 8 This is a schematic diagram of the internal structure of Example 4; Figure 9 This is a reference diagram showing the usage state of this utility model; Figure 10 for Figure 9 A magnified view of part A in the middle.

[0018] In the figure, 1 is the limiting body; 101 is the buffer blind hole; 102 is the buffer groove; 2 is the mounting base plate; 201 is the mounting hole; 202 is the first carbon fiber composite layer; 203 is the damping layer; 204 is the second carbon fiber composite layer; 205 is the buffer spring; 206 is the buffer boss; 3 is the buffer base; and 4 is the frame welding assembly. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings: The directional terms used in the detailed description paragraphs are only for the convenience of those skilled in the art to understand the technical solutions described in this application based on the visual orientation shown in the accompanying drawings. Unless otherwise expressly specified and limited, the terms "setting," "installation," "connection," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] Example 1: like Figures 1 to 3As shown, a limiting block assembly for a rugged off-road vehicle includes a mounting base plate 2. The mounting base plate 2 is used to connect to the frame welding assembly 4 and bears the suspension impact load transmitted by the limiting body 1, ensuring the overall installation stability of the limiting block assembly. The limiting body 1 is fixedly connected to the mounting base plate 2. The limiting body 1 is the core component for realizing suspension limiting. It can directly contact the suspension components, limiting excessive compression or extension of the suspension and avoiding direct collision between the suspension components and the frame. In this embodiment, the limiting body 1 is preferably made of NR natural rubber with a hardness of 60-65HA. The hardness range of 60-65HA can take into account both limiting rigidity and buffering performance, ensuring that it can effectively limit the suspension travel and absorb energy through deformation during impact. Moreover, it is not prone to elastic decay after long-term use, making it suitable for the complex impact scenarios of rugged off-road vehicles. NR natural rubber has good elastic recovery and fatigue resistance, making it suitable for large deformations, and the internal stress of the limiting body 1 is low.

[0021] A buffer blind hole 101 is provided on the side of the limiting body 1 near the mounting base plate 2. The buffer blind hole 101 provides additional deformation space for the limiting body 1 when it is impacted, thereby improving the impact absorption capacity and reducing the weight of the limiting body 1, thus reducing the unsprung mass of the suspension. The mounting base plate 2 is provided with a damping buffer mechanism for absorbing vibration. The damping buffer mechanism is used to absorb high-frequency vibrations transmitted by the suspension again, reducing the transmission of vibration to the cab and improving ride comfort. Mounting holes 201 are provided near both ends of the mounting base plate 2. The mounting holes 201 provide mounting positions for bolts, enabling a detachable connection between the mounting base plate 2 and the frame welded assembly 4. The openings at both ends ensure even distribution of force and prevent the mounting base plate 2 from warping due to unilateral force.

[0022] The damping and buffering mechanism includes a first carbon fiber composite layer 202, a damping layer 203, and a second carbon fiber composite layer 204. These three layers constitute the mounting base plate 2 in this embodiment. The two sides of the damping layer 203 are bonded and fixed to the first carbon fiber composite layer 202 and the second carbon fiber composite layer 204, respectively. This three-layer composite structure serves as the mounting base plate 2, simultaneously meeting the dual requirements of load-bearing fixation and damping / vibration reduction. Compared to a mounting base plate made of a single material, this composite base plate ensures structural strength for connection to the vehicle frame through the carbon fiber composite layer and achieves vibration reduction through the damping layer 203, thus addressing the dual defects of deformation and vibration noise in existing base plates, thereby balancing safety and comfort.

[0023] Specifically, in this embodiment, both the first carbon fiber composite layer 202 and the second carbon fiber composite layer 204 are made of carbon fiber reinforced resin matrix composite material. Carbon fiber reinforced resin matrix composite material is existing technology. In this embodiment, commonly used woven carbon fibers such as T300, T500, and T700 are preferred as the reinforcing phase, and epoxy resin is used as the matrix. The composite material is formed by high-temperature curing. The damping layer 203 is made of hydrogenated nitrile butadiene rubber. Hydrogenated nitrile butadiene rubber has excellent damping characteristics and environmental adaptability, and can efficiently absorb high-frequency vibrations generated by impacts, preventing vibrations from being transmitted to the frame through the base plate and causing resonance noise.

[0024] When the damping layer 203 is bonded to the first carbon fiber composite layer 202 and the second carbon fiber composite layer 204, and when the limiting body 1 is connected to the mounting base plate 2 of the composite material, the composite material co-curing method is used for bonding and fixing. This can improve the interlayer bonding strength, resist the risk of impact peeling, eliminate interlayer gaps, avoid the formation of cavity resonance, and block the transmission path of vibration noise.

[0025] Example 2: A limiting block assembly for a rugged off-road vehicle includes a damping buffer mechanism comprising a buffer spring 205. In this embodiment, the buffer spring 205 serves as the core component of the damping buffer mechanism. Utilizing the elastic deformation of the spring, it absorbs suspension impact loads and forms a double buffer with the buffer blind hole 101 of the limiting body 1, further weakening the impact intensity and reducing damage to the mounting base plate 2 and the vehicle frame. The buffer spring 205 is located within the buffer blind hole 101, with one end abutting against the inner end face of the buffer blind hole 101. The buffer blind hole 101 radially limits the buffer spring 205, preventing lateral displacement or tilting when impacted, ensuring the spring's buffering direction aligns with the impact direction, and improving buffering efficiency. The abutting of one end of the spring against the inner end face of the blind hole allows direct transmission of the spring's buffering force to the limiting body 1, assisting the limiting body 1 in dispersing impact stress. The other end of the buffer spring 205 abuts against the mounting base plate 2. On the one hand, when the buffer spring 205 is subjected to impact compression, it allows for a slight axial displacement of the spring, avoiding stress concentration. On the other hand, the counteracting state ensures that the spring is always in contact with the mounting base plate 2, stably transmitting the buffer reaction force to the mounting base plate 2, while simplifying the assembly process and reducing the risk of component installation errors. Furthermore, when the spring undergoes slight deformation after long-term use, the counteracting method can adaptively adjust the contact state to maintain the stability of the buffering performance and avoid uneven local stress caused by spring deformation.

[0026] In this embodiment, the buffer spring 205 is made of 65Mn low-manganese spring steel. 65Mn spring steel has good hardenability and high strength, making it easy to manufacture springs with smaller dimensions. It also has excellent elastic limit and fatigue strength, maintaining stable elastic properties during repeated compression and extension. It is not prone to spring breakage or permanent deformation and can withstand alternating loads from suspension impacts for a long time, ensuring the reliability of the buffer function. Other structures are the same as in Embodiment 1.

[0027] Example 3: like Figures 4 to 6 As shown, in this embodiment, the mounting base plate 2 is made of QSTE500TM structural steel, and the other structures are the same as in Embodiment 2. QSTE500TM structural steel is a high-strength low-alloy structural steel with high yield strength and good toughness. It can withstand continuous impact loads during off-road driving, preventing plastic deformation of the mounting base plate 2. At the same time, it has excellent fatigue resistance, which can extend the service life of the mounting base plate 2, making it suitable as a load-bearing component with high strength requirements.

[0028] During manufacturing, the limiting body 1 and the metal mounting base plate 2 are integrally formed using an inter-aluminum-white-cobalt adhesive system, ensuring the bonding and fixing strength of the two.

[0029] Example 4: like Figure 7 and Figure 8 As shown, a limiting block assembly for a rugged off-road vehicle has a buffer groove 102 on the side of the limiting body 1 near the mounting base plate 2. The buffer groove 102 increases the contact area between the limiting body 1 and the mounting base plate 2, allowing the impact load transmitted by the limiting body 1 to be more evenly distributed to the mounting base plate 2, avoiding localized stress concentration on the mounting base plate 2. The mounting base plate 2 has a buffer boss 206 that matches the buffer groove 102, and the other end of the buffer spring 205 abuts against the buffer boss 206. The buffer boss 206 enables precise positioning of the limiting body 1 and the mounting base plate 2, preventing relative displacement due to vibration during vehicle operation and ensuring the overall structural stability of the assembly; at the same time, it enhances the local strength of the corresponding position on the mounting base plate 2, preventing the mounting base plate 2 from denting and deforming under the force of the buffer spring 205.

[0030] During manufacturing, the buffer boss 206 and the mounting base plate 2 are integrally formed using a stamping process, meaning the buffer boss 206 and the mounting base plate 2 are an integrated structure. Stamping also makes the metal structure of the boss area denser, improving its impact resistance and deformation resistance. Furthermore, stamping is highly efficient and suitable for mass production. Other structural features are the same as in Embodiment 2.

[0031] Working principle: like Figure 9 and Figure 10As shown, this utility model is used in conjunction with the frame welding assembly 4. During installation, a buffer base 3 is fixed on the frame welding assembly 4, and the limiting block assembly is detachably connected to the buffer base 3 through the mounting holes 201 of the mounting base plate 2 and fasteners such as bolts.

[0032] When the vehicle encounters an impact while off-road, the suspension components first come into contact with the limiting body 1. The limiting body 1 absorbs part of the impact energy through its own elastic deformation. At the same time, the internal buffer blind hole 101 provides additional deformation space, further weakening the impact intensity and reducing the load directly transmitted to the mounting base plate 2.

[0033] In Example 1, the damping layer 203 in the three-layer composite structure of the mounting base plate 2 absorbs excess high-frequency vibrations, while the two carbon fiber composite layers rely on their high strength to resist deformation. At the same time, the co-curing and bonding eliminates the gaps between the layers, thus avoiding resonance noise caused by vibration.

[0034] In Examples 3 and 4, the buffer spring 205 is compressed and deformed within the buffer blind hole 101, forming a double buffer with the limiting body 1. This alters the overall compression stiffness curve of the limiting block assembly, transforming its linear stiffness curve into a non-linear stiffness curve. This results in a more comfortable and less abrupt engagement for the driver and passengers. Simultaneously, the buffer spring 205 provides stable support and uniform stress distribution, significantly extending the fatigue life of the structure and maintaining its height stability. It also reduces the impact of height attenuation caused by fatigue in the rubber material of the limiting body 1. In Example 4, a buffer groove 102 and a buffer boss 206 are added to increase the contact area with the mounting base plate 2, preventing localized stress concentration. The buffer boss 206 also disperses the spring reaction force, preventing localized depressions in the mounting base plate 2.

[0035] Example 2 combines the three-layer composite mounting base plate 2 with the buffer spring 205 to achieve better vibration absorption, improve the safety and stability of the off-road limiting structure of the hardcore off-road vehicle, and at the same time take into account the ride comfort on undulating urban roads.

[0036] Finally, although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A limiting block assembly for a rugged off-road vehicle, comprising a mounting base plate (2), wherein a limiting body (1) is fixedly connected to the mounting base plate (2), characterized in that: The limiting body (1) has a buffer blind hole (101) on one side near the mounting base plate (2). The mounting base plate (2) is provided with a damping buffer mechanism for absorbing vibration. The mounting base plate (2) has mounting holes (201) at both ends.

2. The limiting block assembly for a rugged off-road vehicle according to claim 1, characterized in that: The damping buffer mechanism includes a buffer spring (205), which is located inside the buffer blind hole (101). One end of the buffer spring (205) abuts against the inner end face of the buffer blind hole (101), and the other end of the buffer spring (205) abuts against the mounting base plate (2).

3. A limit block assembly for a rugged off-road vehicle according to claim 2, characterized in that: The limiting body (1) has a buffer groove (102) on one side near the mounting base plate (2), and the mounting base plate (2) has a buffer boss (206) that matches the buffer groove (102). The other end of the buffer spring (205) abuts against the buffer boss (206).

4. A limit block assembly for a rugged off-road vehicle according to claim 3, characterized in that: The buffer boss (206) and the mounting base plate (2) are integrally formed by stamping process.

5. A limit block assembly for a rugged off-road vehicle according to any one of claims 2 to 4, characterized in that: The limiting body (1) is made of NR natural rubber with a hardness of 60-65HA, the mounting base plate (2) is made of QSTE500TM structural steel, and the buffer spring (205) is made of 65Mn low manganese spring steel.

6. A limit block assembly for a rugged off-road vehicle according to claim 1 or 2, characterized in that: The damping buffer mechanism includes a first carbon fiber composite layer (202), a damping layer (203), and a second carbon fiber composite layer (204). The two sides of the damping layer (203) are respectively bonded and fixed to the first carbon fiber composite layer (202) and the second carbon fiber composite layer (204).

7. A limit block assembly for a rugged off-road vehicle according to claim 6, characterized in that: The first carbon fiber composite layer (202) and the second carbon fiber composite layer (204) are both made of carbon fiber reinforced resin matrix composite material, and the damping layer (203) is made of hydrogenated nitrile rubber.

8. A limit block assembly for a rugged off-road vehicle according to claim 7, characterized in that: The limiting body (1) is made of NR natural rubber with a hardness of 60-65HA.

Images