Automobile front shock absorber

Abstract

The utility model relates to the technical field of automobile shock absorbers, in particular to an automobile front shock absorber which comprises a shock absorber body, a spring plate, a blank cap, a piston rod, an upper support assembly, a TPU buffer block and a nylon reinforcing ring, the TPU buffer block and the nylon reinforcing ring are of an integrated injection molding structure, and double-layer convex ribs and single-layer convex points are arranged on the surface of an inner hole of the TPU buffer block. One end of the exhaust groove is communicated with an inner hole of the TPU buffer block, the other end of the exhaust groove extends to the outer surface of the TPU buffer block, and hollowed-out structures are evenly distributed on the outer surface of the nylon reinforcing ring. Compared with the prior art, an integrated injection molding structure of the TPU buffer block and the nylon reinforcing ring is adopted, so that the interface bonding strength of the TPU buffer block and the nylon reinforcing ring is ensured, the elasticity and the rigidity are both considered, the assembly links are reduced, and the production cost is reduced; the hollow structure of the nylon reinforcing ring is matched, so that light weight of the product is realized, and the requirements of structural strength and durability are met.

Description

Technical Field

[0001] This utility model relates to the field of automotive shock absorber technology, specifically an automotive front shock absorber. Background Technology

[0002] In traditional automotive shock absorber design, the buffer block is a key component for suppressing suspension impacts, and its performance directly affects vehicle durability and NVH, namely noise, vibration, and acoustic roughness.

[0003] Currently, mainstream solutions suffer from the following technical bottlenecks:

[0004] Traditional buffer blocks are mostly made of natural rubber or ordinary polyurethane (PU). Under long-term compression, high temperature, and oil corrosion, traditional buffer blocks are prone to hardening and cracking. Experimental data shows that the elastic modulus of rubber buffer blocks decreases by more than 35% after 100,000 compression cycles. In addition, the reinforcing rings of buffer blocks are generally made of metal, such as Q235 steel, resulting in an increase in weight of about 200-300g per piece, which contradicts the lightweight requirements of new energy vehicles.

[0005] Traditional shock absorber blocks typically have smooth surfaces, which can easily generate frictional noise when in contact with the shock absorber's outer cylinder or piston rod; measured noise levels can reach over 45dB.

[0006] Traditional buffer blocks have insufficient space for material flow during compression, resulting in internal stress concentration in local areas. Finite element analysis shows that the stress peak exceeds 8 MPa, which accelerates fatigue damage.

[0007] The composite process of rubber vulcanization and metal reinforcing ring has the problem of low interfacial bonding strength, with peel strength usually <15N / mm, which can easily lead to delamination failure after long-term use.

[0008] With the increasing demands for driving range and cabin quietness in new energy vehicles, as well as the need for component integration due to the modularization of vehicle platforms, there is a need to design a front shock absorber for automobiles that can achieve lightweighting and noise reduction while meeting structural strength and durability requirements. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide a front shock absorber for automobiles that achieves lightweighting and noise reduction while meeting structural strength and durability requirements.

[0010] To achieve the above objectives, this utility model provides a front shock absorber for automobiles, comprising a shock absorber body, a spring disc, a cap, a piston rod, an upper bracket assembly, a TPU buffer block, and a nylon reinforcing ring. A spring disc is welded to the outer side of the shock absorber body, and a cap is installed at the end of the shock absorber body. One end of the piston rod passes through the cap and is located inside the shock absorber body. The other end of the piston rod is installed with the upper bracket assembly. The piston rod passes through the inner hole of the TPU buffer block, and the end of the TPU buffer block is embedded in the back of the upper bracket assembly. A groove is provided on the TPU buffer block near the shock absorber body, and the nylon reinforcing ring is installed in the groove. The TPU buffer block and the nylon reinforcing ring are integrally injection molded structures. The inner surface of the TPU buffer block has double-layered ribs and single-layered protrusions. One end of the exhaust groove is connected to the inner hole of the TPU buffer block, and the other end of the exhaust groove extends to the outer surface of the TPU buffer block. The outer surface of the nylon reinforcing ring has several evenly distributed hollow structures.

[0011] The surface of the upper support assembly is provided with bolt posts.

[0012] A suspension spring is installed between the spring disc and the upper bracket assembly.

[0013] The TPU buffer block is interference-fitted with the upper bracket assembly.

[0014] The opening at the other end of the TPU buffer block is a cross-shaped opening.

[0015] The double-layer ribs include two layers of rib rings, which are arranged axially along the inner hole of the TPU buffer block. Each layer of rib rings consists of several rib bodies.

[0016] The single-layer protrusion is composed of a number of protrusion bodies arranged together.

[0017] The outer surface of the TPU buffer block has an arc-shaped protrusion, and a groove is provided on each side of the arc-shaped protrusion.

[0018] The damper body is a twin-tube damper structure, and the twin-tube damper structure has a piston valve and a bottom valve inside.

[0019] Compared with existing technologies, this utility model adopts an integrated injection-molded structure of TPU buffer block and nylon reinforcing ring, which ensures the interface bonding strength of the two, balances elasticity and rigidity, reduces assembly steps, and lowers production costs. The hollow structure of the nylon reinforcing ring enables product lightweighting while meeting structural strength and durability requirements. The coordinated design of the raised ribs, raised points and exhaust grooves on the surface of the TPU buffer block reduces friction noise and gas whistling. It is especially suitable for new energy vehicles and high-end passenger vehicles with strict requirements for lightweighting and NVH performance. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a partial sectional view of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the TPU buffer block and nylon reinforcing ring of this utility model.

[0023] Figure 4 This is a front view of the TPU buffer block and nylon reinforcing ring of this utility model.

[0024] Figure 5 This is a top view of the TPU buffer block and nylon reinforcing ring of this utility model.

[0025] Figure 6 This is a cross-sectional view of the TPU buffer block and nylon reinforcing ring of this utility model.

[0026] Figure 7 This is a schematic diagram of the structure of the TPU buffer block of this utility model.

[0027] Figure 8 This is a front view of the TPU buffer block of this utility model.

[0028] Figure 9 This is a schematic diagram of the nylon reinforcing ring of this utility model. Detailed Implementation

[0029] The present invention will now be further described with reference to the accompanying drawings.

[0030] See Figure 1 , Figure 2 This utility model is a front shock absorber for automobiles, including a shock absorber body 1, a spring disc 2, a cap 3, a piston rod 6, an upper bracket assembly 5, a TPU buffer block 4, and a nylon reinforcing ring 7. The spring disc 2 is welded to the outside of the shock absorber body 1, and the cap 3 is installed at the end of the shock absorber body 1. One end of the piston rod 6 passes through the cap 3 and is located inside the shock absorber body 1. The other end of the piston rod 6 is installed on the upper bracket assembly 5. The piston rod 6 passes through the inner hole of the TPU buffer block 4, and the end of the TPU buffer block 4 is embedded in the back of the upper bracket assembly 5.

[0031] See Figures 3-6 The TPU buffer block 4 has a groove 4-1 near the damper body 1. The nylon reinforcing ring 7 is installed in the groove 4-1. The TPU buffer block 4 and the nylon reinforcing ring 7 are integral injection molded structures, which ensures the interface bonding strength between the TPU buffer block 4 and the nylon reinforcing ring 7, takes into account both elasticity and rigidity, and also reduces assembly steps, reducing production costs by more than 25%.

[0032] See Figure 7 , Figure 8 One end of the exhaust groove 4-6 is connected to the inner hole of the TPU buffer block 4, and the other end of the exhaust groove 4-6 extends to the outer surface of the TPU buffer block 4. The exhaust groove 4-6 is used to discharge the air in the gap between the inner hole of the TPU buffer block 4 and the outer diameter of the piston rod 6 when the TPU buffer block 4 is compressed, thereby effectively avoiding noise.

[0033] The other end of the TPU buffer block 4 has a cross-shaped opening 4-3, which is used to expel air from the gap between the inner hole of the TPU buffer block 4 and the outer diameter of the piston rod 6 when the TPU buffer block 4 is compressed, thereby effectively avoiding noise.

[0034] The inner surface of the TPU buffer block 4 has double-layer ribs 4-4 and single-layer protrusions 4-5. The double-layer ribs 4-4 consist of two layers of rib rings arranged axially along the inner hole of the TPU buffer block 4. Each rib ring consists of several rib bodies with a width of 1mm, a height of 0.5mm, and a length of 2-4mm. The single-layer protrusions 4-5 consist of several protrusion bodies arranged with a diameter of 1-2mm. The double-layer ribs 4-4 and single-layer protrusions 4-5 are designed to ensure that the friction between the TPU buffer block 4 and the piston rod 6 is point contact after compression, utilizing the elastic deformation characteristics of the material to reduce the contact area with the piston rod 6 and suppress resonance noise.

[0035] The outer surface of the TPU buffer block 4 has a ring of arc-shaped protrusions 4-2, with a height of 2-3mm. These protrusions form a non-contact guiding structure with the inner wall of the shock absorber's outer cylinder, absorbing vibration energy and reducing friction noise through elastic deformation. A groove 4-7 is provided on each side of the arc-shaped protrusion 4-2. The depth of the groove 4-7 is 10%-20% of the diameter of the TPU buffer block 4, and they are arranged in a ring shape. During compression, this guides the material to flow into the groove 4-7, avoiding stress concentration and improving fatigue life.

[0036] The grooves 4-7, the arc-shaped protrusions 4-2, the double-layer ribs 4-4, and the single-layer protrusions 4-5 are formed simultaneously using in-mold engraving technology, avoiding stress defects caused by secondary processing.

[0037] See Figure 9 The outer surface of the nylon reinforcing ring 7 is evenly distributed with several hollow structures 7-1, which further reduces weight while maintaining structural rigidity.

[0038] The upper bracket assembly 5 has bolt posts 5-1 on its surface for connection to the vehicle body. A suspension spring is installed between the spring disc 2 and the upper bracket assembly 5, allowing for the installation of suspension springs of different specifications to suit different vehicle models.

[0039] To ensure a secure connection, the TPU buffer block 4 is interference-fitted with the upper bracket assembly 5.

[0040] The damper body 1 is a traditional twin-tube damper structure. The twin-tube damper structure has a piston valve and a bottom valve inside to provide damping force.

[0041] The nylon reinforcing ring 7 is preferably glass fiber reinforced nylon PA66-GF30 or polycarbonate PC, and the TPU buffer block 4 is preferably elastic thermoplastic polyurethane TPU, which has excellent fatigue resistance, impact resistance and oil resistance, and is suitable for high-frequency compression conditions of automotive shock absorbers.

[0042] Bench tests showed that the TPU buffer block 4 maintained its elasticity in an environment of -40℃ to 120℃, and its durability was improved by 40% compared with traditional rubber. The nylon reinforcing ring 7 with hollow structure 7-1 reduced the weight by 30%-40%, and CAE simulation verified that its stiffness met the requirements of compression load above 10kN.

[0043] This invention employs an integrated injection-molded structure of a TPU buffer block and a nylon reinforcing ring, ensuring the interfacial bonding strength of the two components while balancing elasticity and rigidity. It also reduces assembly steps and lowers production costs. The hollowed-out structure of the nylon reinforcing ring achieves product lightweighting while meeting structural strength and durability requirements. The coordinated design of the raised ribs, protrusions, and venting grooves on the TPU buffer block surface reduces friction noise and gas whistling. It is particularly suitable for new energy vehicles and high-end passenger vehicles with stringent requirements for lightweighting and NVH performance.

Claims

1. A car front shock absorber, comprising a shock absorber body (1), a spring disc (2), a bung (3), a piston rod (6), an upper bracket assembly (5), a TPU buffer block (4), a nylon reinforcing ring (7), characterized in that: The outer side of the damper body (1) is welded with a spring disc (2), the end of the damper body (1) is mounted with a muff cover (3), one end of the piston rod (6) penetrates through the muff cover (3) and is located in the interior of the damper body (1), the other end of the piston rod (6) is mounted with an upper support assembly (5), the piston rod (6) penetrates through the inner hole of the TPU buffer block (4), and the end of the TPU buffer block (4) is embedded into the back of the upper support assembly (5), a circle of clamping grooves (4-1) are arranged on the position of the TPU buffer block (4) close to the damper body (1), a nylon reinforcing ring (7) is mounted in the clamping grooves (4-1), and the TPU buffer block (4) and the nylon reinforcing ring (7) are an integral injection structure, the inner hole surface of the TPU buffer block (4) is provided with double-layer convex ribs (4-4) and single-layer convex points (4-5), one end of the exhaust groove (4-6) is communicated with the inner hole of the TPU buffer block (4), the other end of the exhaust groove (4-6) extends to the outer surface of the TPU buffer block (4), and the outer surface of the nylon reinforcing ring (7) is uniformly provided with a plurality of hollow structures (7-1).

2. The automobile front shock absorber according to claim 1, characterized by: The surface of the upper support assembly (5) is provided with a bolt column (5-1).

3. The automobile front shock absorber according to claim 1, characterized by: The spring disc (2) and the upper support assembly (5) are mounted with a suspension spring.

4. The front shock absorber of claim 1, wherein: The TPU buffer block (4) is in interference fit with the upper support assembly (5).

5. The front shock absorber of claim 1, wherein: The opening of the other end of the TPU buffer block (4) is a cross opening (4-3).

6. The automobile front shock absorber according to claim 1, characterized by: The double-layer convex ribs (4-4) include two layers of convex rib rings, and the two layers of convex rib rings are arranged along the axial direction of the inner hole of the TPU buffer block (4), and each layer of convex rib ring is composed of a plurality of convex rib bodies.

7. The automobile front shock absorber according to claim 1, characterized by: The single-layer convex points (4-5) are arranged by a plurality of convex point bodies.

8. The automobile front shock absorber according to claim 1, characterized by: The outer surface of the TPU buffer block (4) is provided with a circle of arc-shaped protrusions (4-2), and one groove (4-7) is arranged on the two sides of the arc-shaped protrusion (4-2).

9. The automobile front shock absorber according to claim 1, characterized by: The damper body (1) is a double-cylinder damper structure, and the double-cylinder damper structure is internally provided with a piston valve and a bottom valve.

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