One-step formed shock absorber dust cover, rubber formula and preparation method

Abstract

The invention belongs to the field of automobile chassis shock absorber protective covers, and discloses a one-time forming shock absorber dust cover, a rubber formula and a preparation method, and the one-time forming shock absorber dust cover comprises a dust cover body which is of a hollow structure and is arranged on the periphery of a shock absorber in a sleeving mode; the mounting base and the dust cover body are integrally formed; the free end of the dust cover body extends towards one side away from the mounting base; and the Shore A hardness range of the dust cover is 58-62. The dustproof cover body and the mounting base are formed at a time in a rubber vulcanization mode, formation of mounting gaps is reduced, the overall sealing performance is improved, and the dustproof effect of a finished product is improved.

Description

Technical Field

[0001] This invention belongs to the field of chassis manufacturing technology, and in particular to the field of automotive chassis shock absorber protective covers, specifically relating to one-piece molded shock absorber dust covers, rubber formulations and preparation methods. Background Technology

[0002] The dust cover for automotive shock absorbers is a chassis shock absorber part used to protect the shock absorbers and extend their lifespan.

[0003] In existing technology, the dust cover and vibration isolation pad of the shock absorber are two separate products. The dust cover is connected to the vibration isolation pad through polyurethane, which is costly, inefficient, and has poor dust protection. Moreover, the wall thickness of the dust cover varies greatly, making it difficult to form. Summary of the Invention

[0004] The purpose of this invention is to solve at least one of the above-mentioned technical problems and to provide a one-piece molded dust cover for automotive shock absorbers, which has an integrally connected mounting base, eliminating the connection process between the two in the prior art, and improving the overall dustproof effect because there are no connection marks.

[0005] To achieve the above objectives, as a first aspect, the present invention provides a one-piece molded dust cover for automotive shock absorbers, comprising: The dust cover body has a hollow structure and is fitted around the shock absorber. The mounting base is integrally formed with the dust cover body; the free end of the dust cover body extends away from the mounting base. The dust cover has a Shore A hardness range of 58-62.

[0006] According to the present invention, the peripheral wall of the dust cover body is further formed with corrugations, and the corrugation transition radius is 2.0mm-2.8mm.

[0007] According to the present invention, the mounting base and the dust cover body are further subjected to an integral vulcanization molding process.

[0008] According to the present invention, the vulcanization process further utilizes a vulcanization mold to achieve integral molding. The vulcanization mold has at least two injection holes, which correspond to the bottom of the mounting base and the free end of the dust cover body, respectively.

[0009] As a second aspect, the present invention also provides a natural rubber composite material for the aforementioned one-piece molded automotive shock absorber dust cover, the formulation of which is given by weight as follows: 100 parts of natural rubber SVR-3L; Carbon black N55040-50 parts; 5-10 parts of silica; 3-5 parts of softener; 5-10 parts activator; Anti-aging agent 2-4 parts; Processing aids: 6-10 parts; 1-2 parts of vulcanizing agent; Accelerator 2-4 parts.

[0010] Preferably, the softener is naphthenic oil; the activator is a mixture of 4-8 parts zinc oxide and 1-2 parts stearic acid.

[0011] Preferably, the antioxidant is a mixture of 1-2 parts antioxidant 4010NA and 1-2 parts antioxidant RD.

[0012] Preferably, the processing aid is a mixture of 3-5 parts oleamide and 3-5 parts ANTIWAX 6268; the vulcanizing agent is sulfur; and the accelerator is a mixture of 1-2 parts accelerator CZ and 1-2 parts accelerator TBTD.

[0013] As a third aspect, the present invention also provides a method for preparing a shock absorber dust cover, using the aforementioned natural rubber composite material, comprising the following steps: Mix the above raw materials to ensure that each component is evenly dispersed; then sheet and cool. Pre-cut the compounded rubber into rubber blanks of a specified weight; The rubber blank is placed into a preheated vulcanizing mold for vulcanization to form the finished product.

[0014] Preferably, a pressure of 18 MPa is applied during the vulcanization process, and the vulcanization time is 240 seconds; the gas is vented 1-3 times during the vulcanization process.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention molds the dust cover body and the mounting base in one step through rubber vulcanization, reducing the formation of installation gaps, improving overall sealing, and enhancing the dustproof effect of the finished product.

[0016] This invention uses a specific natural rubber composite material to solve the problems of large differences in wall thickness and difficulty in molding rubber products, thereby improving the qualification rate of finished products.

[0017] The natural rubber composite material of the present invention, in combination with zinc oxide, stearic acid, accelerator CZ, and TBTD, and the setting of the injection hole position of the vulcanizing mold, ensures that the rubber compound is vulcanized uniformly in the mold.

[0018] The natural rubber composite material of the present invention is modified with an antioxidant, which effectively improves the product's aging resistance and anti-exudation ability, and extends its service life. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the one-piece molded dust cover structure for an automotive shock absorber according to the present invention. Figure 2 for Figure 1 Another structural diagram from a different perspective; Figure 3 This is a schematic diagram of the working process of the vulcanization mold of the present invention; Reference numerals: 100-Dust cover body, 200-Mounting base, 300-Vulcanizing mold, 310-Injection hole. Detailed Implementation

[0020] To make the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0021] like Figures 1 to 3 As shown in the illustration, this application provides a one-piece molded dust cover for automotive shock absorbers, comprising a dust cover body 100 and an integrally molded mounting base 200, solving the problem of poor dustproofing due to gaps formed during the separate assembly of the two parts in the prior art. The dust cover body 100 is a hollow cylindrical shape with corrugated edges on its peripheral wall, starting from the mounting base 200 and extending away from the mounting base 200. The Shore A hardness of the one-piece molded automotive shock absorber dust cover is in the range of 58-62, preferably 60, which maintains the elasticity of the dust cover while ensuring its wear resistance and reducing vibration and impact during shock absorber operation. The wall thickness of the dust cover body 100 is 2mm-5mm; the corrugated transition radius is 2.0mm-2.8mm, preferably 2.5mm.

[0022] The dust cover body 100 and the mounting base 200 are integrally molded using a vulcanization process; the dust cover body 100 and the mounting base 200 are processed into an integral structure using a vulcanization mold 300; wherein, the vulcanization mold 300 has at least two injection holes 310, the injection holes 310 respectively correspond to the bottom of the mounting base 200 and the free end of the dust cover body 100, ensuring that the adhesive flows from both sides to the middle, ensuring the adhesive coverage area, and improving the sealing effect of the integrally molded structure.

[0023] In this embodiment, the dust cover body 100 is made of natural rubber composite material, and its formula is recorded in parts by weight as follows: 100 parts of natural rubber SVR-3L; Carbon black N55040-50 parts; 5-10 parts of silica; 3-5 parts naphthenic oil; 4-8 parts zinc oxide; 1-2 parts stearic acid; Anti-aging agent 4010NA 1-2 parts; Anti-aging agent RD 1-2 parts; Oleamide (VRX) 3-5 parts; ANTIWAX 62683-5 copies; 1-2 parts sulfur; Accelerator CZ 1-2 parts; Accelerator TBTD 1-2 parts.

[0024] This formulation uses natural rubber SVR-3L as the base material, which has excellent elasticity and molding flowability, and can adapt to product structures with large differences in wall thickness. Carbon black N550 and silica are combined to effectively enhance the mechanical strength and abrasion resistance of the rubber material. Naphthenic oil is used as a softener to improve the processing flowability of the rubber compound. Zinc oxide and stearic acid, together with accelerators CZ and TBTD, can improve the vulcanization reaction rate and ensure uniform vulcanization of the rubber compound in the mold. Antioxidants 4010NA, RD and ANTIWAX 6268 can improve the product's aging resistance and anti-exudation ability, and extend its service life.

[0025] The manufacturing process of the dust cover body is as follows: The above raw materials are put into an internal mixer and mixed at 70°C for 8 minutes to ensure that the components are evenly dispersed; then the sheets are extruded on a two-roll mill, cooled and left to stand for 24 hours. Pre-cut the compounded rubber into rubber blanks of a specified weight; Preheat the vulcanizing mold to 155°C and place the rubber blank into the mold cavity; Close the mold, apply a pressure of 18 MPa, and vulcanize for 240 seconds; The mold is opened, the product is removed, and the flash is trimmed to obtain a one-piece molded dust cover product with a Shore A hardness of 60.

[0026] During the vulcanization process, the gas is vented 1-3 times to remove the gas, reduce the probability of bubbles appearing in the finished product, and improve the quality of the finished product.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A one-piece dust boot for a shock absorber of an automotive vehicle, characterized by, The dust cover body is a hollow structure, sleeved on the outer periphery of the shock absorber; The mounting base is integrally formed with the dust cover body; The free end of the dust cover body extends away from the mounting base; The dust cover has a Shore A hardness ranging from 58 to 62. The peripheral wall of the dust cover body is formed with corrugations, and the transition fillet of the corrugations is 2.0-2.8mm.

2. The one-piece molded automotive shock absorber boot of claim 1 wherein, The mounting base and the dust cover body are integrally formed by using an integral vulcanization molding process.

3. The one-piece molded automotive shock absorber boot of claim 1 wherein, The integral molding is achieved by using a vulcanization mold in the vulcanization process, and the vulcanization mold has at least two glue injection holes corresponding to the bottom of the mounting base and the free end of the dust cover body.

4. The one-piece molded automotive shock absorber boot of claim 3 wherein, 5. A natural rubber composite material for the one-step formed dust cover of the automobile shock absorber according to any one of claims 1-4, characterized in that the formula is as follows (in parts by weight): Natural rubber SVR-3L 100 parts; Carbon black N550 40-50 parts; White carbon black 5-10 parts; Softener 3-5 parts; Activator 5-10 parts; Anti-aging agent 2-4 parts; Processing aid 6-10 parts; Vulcanizing agent 1-2 parts; Accelerator 2-4 parts. The softener is naphthenic oil; the activator is a mixture of 4-8 parts of zinc oxide and 1-2 parts of stearic acid.

6. The natural rubber composite of claim 5, wherein The anti-aging agent is a mixture of 1-2 parts of anti-aging agent 4010NA and 1-2 parts of anti-aging agent RD.

7. The natural rubber composite of claim 5, wherein the natural rubber composite has a tensile strength of at least 2.5 MPa. The processing aid is a mixture of 3-5 parts of oleic acid amide and 3-5 parts of ANTIWAX 6268; the vulcanizing agent is sulfur; and the accelerator is a mixture of 1-2 parts of accelerator CZ and 1-2 parts of accelerator TBTD.

8. The natural rubber composite of claim 5, wherein The following steps are taken, 9. A method of manufacturing a dust boot for a shock absorber using the natural rubber composite material according to claim 5, characterized by Mix the above raw materials to ensure uniform dispersion of each component, then sheet out and cool; Pre-cut the rubber compound into rubber blanks of a specified weight; Place the rubber blank into a preheated vulcanization mold and vulcanize to form the finished product. During the vulcanization process, a pressure of 18MPa is applied, and the vulcanization time is 240 seconds; during the vulcanization process, the exhaust is 1-3 times, and the exhaust gas is discharged.

10. A method of making a dust boot for a shock absorber as in claim 9, wherein, ​

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