A hose and tube assembly for an automotive ABS master cylinder

Abstract

The application discloses a kind of hoses and oil pipe assembly for automobile ABS brake master cylinder, belong to automobile parts technical field.Hose for automobile ABS brake master cylinder includes in turn from inside to outside: inner rubber layer, intermediate framework layer and outer rubber layer;The rubber of inner rubber layer includes: EPDM raw rubber, liquid ethylene-propylene rubber, carbon black N550, white carbon black, antioxidant 445, stearic acid, 14-40B and crosslinking aid TAIC;Intermediate framework layer is made of yarn knitting;The rubber of outer rubber layer includes: EPDM raw rubber, white carbon black, carbon black N550, stearic acid, zinc oxide, insoluble sulfur, accelerator TBZTD and phenolic adhesive resin.The application is applied to the aspect of automobile ABS brake master cylinder connecting pipe, solve the problem that existing ABS brake master cylinder oil pipe for automobile is strong, loud noise, with high temperature resistance, high pressure resistance, good bending resistance, reduce noise characteristics.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automobile parts, and particularly relates to a hose and oil pipe assembly for an automobile ABS brake master cylinder. BACKGROUND

[0002] At present, as a convenient means of transportation for most people to travel, the safety of the automobile in the driving process is more and more important, and the safety performance of the automobile in the driving process is closely related to the braking system of the automobile. Therefore, the braking system in the driving process of the automobile has a complete set of brake system, which is very important. The birth of the automobile ABS system provides a safer system for the brake in the driving process of the automobile. The ABS system is an anti-lock brake system. In the driving process of the automobile, it is inevitable to encounter wet and slippery weather conditions such as rain and snow, and emergency braking conditions in sudden situations. In the case of emergency braking, the tire may be locked, and the steering wheel will not be able to control the driving direction of the automobile, which is easy to cause traffic accidents.

[0003] The ABS system of the automobile is a safety system for preventing the tire from being locked in the case of emergency braking. The system is composed of an electrical part and a mechanical part. The mechanical part is arranged from the front of the vehicle to the rear of the vehicle, from the front wheel brake caliper part of the front of the vehicle to the rear wheel brake caliper part of the rear of the vehicle, and from the steering wheel part of the driver's cabin. Therefore, a relatively long connecting pipeline is required for connection. The oil from the brake oil pump needs to be dispersed to the calipers at the four hubs of the automobile, and then dispersed to the main pipeline on the four oil pipe lines. The required pipe diameter is thick and pressure-resistant. Since the pipeline part is completely in the engine compartment, and the engine emits a high temperature during operation, the temperature resistance of the pipeline is required to be good.

[0004] The existing technology mostly uses a pipeline formed by nylon in the inner layer, steel wire in the outer layer, and metal pipe buckles pressed and riveted together at both ends. However, the pipeline has the disadvantages of strong steel, and loud noise. Therefore, how to provide a pipeline assembly made of rubber hose with the characteristics of high temperature resistance, high pressure resistance, good bending resistance, and noise reduction is of great significance for the optimization of the ABS system of the automobile. SUMMARY

[0005] In view of the deficiencies of the prior art, the technical problem to be solved by the present application is to overcome the problems of strong steel and loud noise of the existing ABS brake master cylinder oil pipe for an automobile, and to provide a hose and oil pipe assembly for an ABS brake master cylinder of an automobile with the characteristics of high temperature resistance, high pressure resistance, good bending resistance, and noise reduction.

[0006] To solve the technical problem, the technical scheme adopted by the present application is as follows:

[0007] The application provides a hose for an automobile ABS brake master cylinder, which comprises, from inside to outside, an inner rubber layer, an intermediate framework layer and an outer rubber layer.

[0008] The rubber material of the inner rubber layer comprises EPDM raw rubber, liquid ethylene-propylene rubber, carbon black N550, white carbon black, antioxidant 445, stearic acid, 14-40B and cross-linking aid TAIC.

[0009] The intermediate framework layer is made of yarn weaving.

[0010] The rubber material of the outer rubber layer comprises EPDM raw rubber, white carbon black, carbon black N550, stearic acid, zinc oxide, insoluble sulfur, accelerator TBZTD and phenolic adhesive resin.

[0011] Preferably, the Mooney ML (1+4) 100℃ of the rubber material of the inner rubber layer is any value in the range of 85-95.

[0012] Preferably, after the rubber material of the inner rubber layer is soaked in brake oil under the condition of 125℃×168H, the tensile elongation change is any value in the range of -20--4.0%, and the volume change is any value in the range of 0.5-2.0%.

[0013] Preferably, the adhesion of the rubber material of the outer rubber layer to the yarn of the intermediate framework layer is any value in the range of 20-30N / cm.

[0014] Preferably, the rubber material of the inner rubber layer comprises, by weight, 100 parts of EPDM raw rubber, 10-30 parts of liquid ethylene-propylene rubber, 60-90 parts of carbon black N550, 20-40 parts of white carbon black, 1-4 parts of antioxidant 445, 1-3 parts of stearic acid, 2-10 parts of 14-40B and 5-15 parts of cross-linking aid TAIC.

[0015] Preferably, the rubber material of the outer rubber layer comprises, by weight, 100 parts of EPDM raw rubber, 20-40 parts of white carbon black, 40-70 parts of carbon black N550, 1-4 parts of stearic acid, 3-10 parts of zinc oxide, 1-2 parts of insoluble sulfur, 1-4 parts of accelerator TBZTD and 5-10 parts of phenolic adhesive resin.

[0016] The application also provides an oil pipe assembly, which comprises the above-mentioned hose for an automobile ABS brake master cylinder and a hard pipe component connected to the hose.

[0017] Preferably, the hard pipe assembly comprises a hard pipe, a hard pipe core, a fastening sleeve and a connector; the hard pipe is connected with the connector at both ends, one end of the connector is connected with a brake master pump and the other end of the connector is connected with a proportional distributor; the hard pipe core is arranged at the middle part of the hard pipe and sleeved in the soft pipe; the fastening sleeve is sleeved outside both ends of the soft pipe and is connected with the hard pipe core.

[0018] Preferably, the hard pipe core is provided with reverse teeth at both outer sides, the length of the hard pipe core provided with the reverse teeth is 55-65% of the total length of the hard pipe core.

[0019] Preferably, the hard pipe assembly has a pressure explosion resistance of not less than 80 MPa.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] The present application provides a soft pipe for an automobile ABS brake master pump, an oil pipe assembly comprising the soft pipe and a connecting pipe for an automobile ABS brake master pump, and a hard pipe assembly, which has the characteristics of high temperature resistance, high pressure resistance, good bending resistance and noise reduction. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The structure diagram of the soft pipe for an automobile ABS brake master pump provided by the present application;

[0023] Figure 2 The structure diagram of the oil pipe assembly provided by the present application;

[0024] Figure 3 The connection joint diagram of the hard pipe assembly, the brake assembly and the proportional distributor;

[0025] Figure 4 Another connection joint diagram of the hard pipe assembly, the brake assembly and the proportional distributor;

[0026] Figure 5 The connector core diagram;

[0027] Figure 6 The partial enlarged view of B of Figure 5 ;

[0028] Figure 7 The fastening sleeve diagram;

[0029] Figure 8 The hard pipe bulging diagram;

[0030] Figure 9 The partial enlarged view of A of Figure 8 ;

[0031] In the above figures: 1. Flexible tube; 101. Inner rubber layer; 102. Intermediate skeleton layer; 103. Outer rubber layer; 201. Rigid tube; 202. Rigid tube core; 203. Fastening sleeve; 204. Connector. Detailed Implementation

[0032] The technical solutions in specific embodiments of the present invention will now be described in detail and completely with reference to the accompanying drawings. Obviously, the described embodiments are merely some specific implementations of the overall technical solution of the present invention, and not all implementations. Based on the overall concept of the present invention, all other embodiments obtained by those skilled in the art fall within the protection scope of the present invention.

[0033] In one aspect, this invention provides a hose 1 for an automotive ABS master cylinder, such as... Figure 1 As shown, from the inside out, it includes: an inner rubber layer 101, a middle skeleton layer 102, and an outer rubber layer 103. The rubber compound of the inner rubber layer 101 includes: EPDM raw rubber, liquid ethylene propylene rubber, carbon black N550, silica, antioxidant 445, stearic acid, 14-40B, and crosslinking aid TAIC. The middle skeleton layer 102 is made of braided yarn. The rubber compound of the outer rubber layer 103 includes: EPDM raw rubber, silica, carbon black N550, stearic acid, zinc oxide, insoluble sulfur, accelerator TBZTD, and phenolic adhesive resin. This invention provides a hose 1 for an automotive ABS brake master cylinder, and uses the hose 1 as a connecting pipe for the automotive ABS brake master cylinder. The rigid pipe 201 assembly is designed to have high temperature resistance, high pressure resistance, good bending performance, and reduced noise. The inner rubber layer 101 contains no plasticizers to prevent plasticizer leaching after immersion in brake fluid, resulting in excellent low brake fluid extraction performance. The use of liquid ethylene propylene rubber effectively improves the processing performance of the composition without plasticizers, ensuring product dimensional stability and improving product quality. Peroxide vulcanizing agents are also used to enhance the rubber's temperature resistance. The intermediate skeleton layer 102 is partially made of braided yarn to strengthen the temperature and pressure resistance of the hose. The yarn requirements are as follows: 1) Aramid yarn with low tensile strength, elongation at break, and heat shrinkage; 2) Aramid yarn with low elongation, resulting in low expansion performance in the hose skeleton layer; 3) Aramid yarn with high tensile strength and low heat shrinkage, resulting in high pressure resistance in the hose; 4) Aramid yarn with excellent high-temperature resistance, maintaining low expansion performance even under high-temperature conditions. The outer adhesive layer 103 has excellent heat resistance and weather resistance, while also having good adhesion to the yarn. By adding fumed silica and phenolic adhesive resin, the adhesive and yarn achieve high bonding strength, and the adhesion of the adhesive tube can reach more than 22 N / cm.

[0034] It should be noted that the brake system pipeline is relatively long, but the requirement for short braking distance during braking is pursued, and therefore the technical difficulty of the rubber pipeline is to adapt to the large inner diameter, large flow, high pressure resistance, high temperature resistance, and low expansion coefficient of the rubber pipeline. In order to adapt to the needs of different vehicle models, pipelines with inner diameters of 4mm, 6mm, and 8mm need to be designed to adapt to different vehicle models. For large-diameter rubber pipes, the larger the diameter, the more difficult it is to meet the requirements of pressure resistance and low expansion coefficient. The rubber yarn braided pipe is different from the nylon inner layer steel wire braided pipe or metal hard pipe 201, because the hardness of the nylon pipe or metal pipe body is higher than that of the rubber product, and the expansion coefficient of the nylon pipe or metal pipe body is lower than that of the rubber. Rubber itself is an elastomer, which is compressed under the pressure of the medium. At the same time, the outer layer of the nylon pipe is braided with steel wire, and the elongation of the steel wire is less than that of the yarn, and the tensile strength of the steel wire is higher than that of the yarn. In order to solve the difference in expansion coefficient and temperature resistance caused by the difference in materials, the rubber braided pipe of the technical scheme adjusts the formula design of different rubber layers, selects yarn with small elongation and high tensile strength, and adjusts the braiding structure to reduce the expansion coefficient of the rubber pipe and enhance the pressure resistance of the rubber pipe.

[0035] In a preferred embodiment, the Mooney ML(1+4)100℃ of the rubber compound of the inner rubber layer 101 is any value in the range of 85-95. Further, the tensile elongation change of the rubber compound of the inner rubber layer 101 after soaking in brake oil at 125℃x168H is any value in the range of -20 to -4.0%, and the volume change is any value in the range of 0.5 to 2.0%. The technical scheme specifically limits the characteristic requirements of the rubber compound of the inner rubber layer 101. It can be understood that the Mooney ML(1+4)100℃ can also be 86, 87, 88, 89, 90, 91, 92, 93, 94, and any point value within the range thereof; the tensile elongation change of the rubber compound of the inner rubber layer 101 after soaking in brake oil at 125℃x168H can also be -15%, -10%, -5%, and any point value within the range thereof, and the volume change can also be 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, and any point value within the range thereof.

[0036] In a preferred embodiment, the adhesive of the outer rubber layer 103 has an adhesive force of 20-30 N / cm with the yarn of the intermediate skeleton layer 102. This technical solution specifically limits the adhesive force of the adhesive of the outer rubber layer 103 with the yarn of the intermediate skeleton layer 102, effectively ensuring the combination of the outer rubber layer and the intermediate skeleton layer 102. It can be understood that the adhesive force can also be 21 N / cm, 22 N / cm, 23 N / cm, 24 N / cm, 25 N / cm, 26 N / cm, 27 N / cm, 28 N / cm, 29 N / cm, and any point value within the range thereof.

[0037] In a preferred embodiment, by weight, the adhesive of the inner rubber layer 101 includes: 100 parts of EPDM raw rubber, 10-30 parts of liquid ethylene-propylene rubber, 60-90 parts of carbon black N550, 20-40 parts of white carbon black, 1-4 parts of antioxidant 445, 1-3 parts of stearic acid, 2-10 parts of 14-40B, and 5-15 parts of cross-linking aid TAIC.

[0038] In a preferred embodiment, by weight, the adhesive of the outer rubber layer 103 includes: 100 parts of EPDM raw rubber, 20-40 parts of white carbon black, 40-70 parts of carbon black N550, 1-4 parts of stearic acid, 3-10 parts of zinc oxide, 1-2 parts of insoluble sulfur, 1-4 parts of accelerator TBZTD, and 5-10 parts of phenolic adhesive resin.

[0039] The above-mentioned hose 1 for an automobile ABS brake master cylinder is designed by optimizing the formula and composition of each layer, so that the inner rubber layer 101 and the intermediate skeleton layer 102 can be bonded together, the outer rubber layer 103 and the intermediate skeleton layer 102 can be bonded together, and the inner rubber layer 101 can resist brake oil and the outer rubber layer 103 can resist various oils, with small volume expansion after oil resistance.

[0040] Another aspect of the present application provides a hose assembly, which includes the above-mentioned hose 1 for an automobile ABS brake master cylinder and a hard pipe 201 component connected to the hose 1. The hard pipe 201 component includes a hard pipe 201, a hard pipe core 202, a fastening sleeve 203, and a connector 204. Figure 2As shown, the two ends of the hard pipe 201 are connected with the connecting heads 204, one end of the connecting head 204 is connected with the brake master pump, and the other end of the connecting head 204 is connected with the proportional distributor; the hard pipe core 202 is arranged at the middle part of the hard pipe 201 and is sleeved in the hose 1; the fastening sleeve 203 is sleeved outside the two ends of the hose 1 and is connected with the hard pipe core 202. In order to improve the stability of the connection, the outer side of the two ends of the hard pipe core 202 is provided with a reverse tooth, the length of the hard pipe core 202 provided with the reverse tooth is 55-65% of the total length of the hard pipe core 202. Further, the pressure explosion resistance of the hard pipe 201 assembly is not less than 80 MPa. Among them, the fastening sleeve 203 part is made of steel material with good plasticity, toughness and elongation rate; the high-strength and high-toughness steel material is selected to make the fastening part (i.e. the connecting head 204) connected with the brake master pump and the proportional distributor. The assembly is a hose part and a hard pipe 201 part connected together through the extrusion of the fastening sleeve 203 part at the connection position, and the hose and the hard pipe 201 are connected together through extrusion deformation. The hose and the assembly can withstand high temperature and high pressure conditions, the hose part and the metal hard pipe 201 are sealed at the extrusion riveting position, and there is no risk of falling off and leakage. The hose expansion performance is small, the assembly product is that the inner and outer layers of the hose are rubber layers, and the noise can be reduced. The performance requirements of the assembly and the performance of the assembly obtained by the above technical scheme of the application are shown in Table 1.

[0041] Table 1 Performance requirements of the oil pipe assembly and performance of the assembly obtained by the technical scheme of the application

[0042]

[0043] The installation process of the above-mentioned hose 1 and hard pipe 201 assembly includes:

[0044] 1. The pressure explosion resistance of the hard pipe 201 part is not less than 80 MPa, and the high-strength and high-toughness metal hard pipe 201 material is selected.

[0045] 2. The form of the interface connected with the brake master pump and the proportional distributor is processed according to the form of the vehicle use interface, and the form of the hard pipe 201 interface connected through the mold is shown in Figure 3 、 4 , E1, E2, E3 form and size are processed according to the national or international standard. The high-strength and high-toughness steel material is selected to make the fastening part connected with the brake master pump and the proportional distributor, and E4, E5, E6 form and size are processed according to the national or international standard. Among them, the size of E7 is 0-0.2 mm larger than the outer diameter of the selected hard pipe 201, and the connecting fastener can be tightly connected with the interface of the brake master pump and the proportional distributor.

[0046] 3. The outer diameter of the connector core is designed and manufactured according to the inner diameter of the matching hose. The core dimension D1 is generally 0.1 mm larger than the hose inner diameter, allowing for a slight interference fit between the hose inner diameter and D1, ensuring a better fit between the core and the hose inner diameter. The core shape is designed with reverse teeth for optimal sealing performance. The length B1 of the core teeth is approximately 60% of the total core length, reducing the assembly force on the hose and increasing pull-out resistance. The depth B3 in the bottom D2 dimension of the reverse teeth is approximately 0.15 mm, further enhancing sealing performance. The core length is 0.5–1.0 mm shorter than the depth of the fastening sleeve 203 to prevent damage to the inner rubber layer 101 at the core end during use. The core shape and dimensions are achieved using a gear hobbing die, as shown in the attached figure. Figure 5 , 6 As shown.

[0047] 4. The fastening sleeve 203 is made of steel with good plasticity, toughness, and elongation. The length of the fastening sleeve 203C1 should completely encompass the length of the core. The distance between the end of the core and the end of the fastening sleeve 203 should be controlled at 0.5–1.0 mm. The inner diameter D3 of the fastening sleeve 203 should be 0.8–1.2 mm larger than the outer diameter of the hose. If it is too small, it will be difficult to assemble the hose; if it is too large, it will create gaps after compression and riveting, affecting the sealing performance of the product after compression and riveting. The size D5 of the fastening sleeve 203 needs to be 0.3–0.5 mm larger than the size D1. If it is too small, the fastening sleeve 203 will not be able to be squeezed properly; if it is too large, the rigid tube 201 will bulge. If the sizes D6 and D7 are too large, or if D6 and D7 exert a compression and tightening effect on the fastening sleeve 203, it will affect the pull-out resistance. The outer diameter D4 of the fastening sleeve 203 should be about 3 mm larger than the size D3. The design shape of the fastening sleeve 203 is shown in the attached figure. Figure 7 As shown.

[0048] 5. At the connection between the fastening sleeve 203 and the rigid tube 201, two bulges are formed by extruding the metal rigid tube 201 through a die. The inner side of the rigid tube 201 of the fastening sleeve 203 has a bulge D6, with D6 being at least 1.0 mm larger than D5. This bulge provides resistance to pull-out between the fastening sleeve 203 and the rigid tube 201, and also helps to press the fastening sleeve 203 tightly against the outer side of the fastening sleeve 203 (D7). The outer side of the rigid tube 201 of the fastening sleeve 203 has a bulge D7, with D7 being at least 1.0 mm larger than D5. D7 serves to position the fastening sleeve 203. Simultaneously, D6 and D7, through die extrusion, press the fastening sleeve 203C2 tightly, providing a certain degree of sealing. The shape of the fastening sleeve 203 is shown in the attached figure. Figure 8 , 9 As shown.

[0049] 6. Using an extrusion die, the joint between the rigid pipe 201 connector fastening sleeve 203 and the rubber hose is extruded and riveted. The extrusion and riveting method is as follows: Figure 2Three extrusion forms extrusion riveting, the inner layer rubber and hard pipe core 202 outer diameter D1 completely together, through the extrusion deformation of the fastening sleeve 203, the hose is extruded and deformed under the action of force, the inner layer rubber flows to the joint core D2 to form a seal, the extrusion riveting outer diameter D8 size needs to be defined according to the performance verification data to set specific parameters.

[0050] In order to more clearly and in detail introduce the hose 1 and the oil pipe assembly for the automobile ABS brake master cylinder provided by the embodiment of the application, the following will be described in combination with specific embodiments.

[0051] Embodiment 1

[0052] The inner rubber layer 101 rubber composition includes the following components in parts by weight: 100 parts of EPDM raw rubber, 10 parts of liquid ethylene-propylene rubber, 80 parts of carbon black N550, 30 parts of white carbon black, 2 parts of antioxidant 445, 1 part of stearic acid, 4 parts of 14-40B, and 13 parts of crosslinking aid TAIC.

[0053] The Mooney ML (1+4) 100℃ of the rubber composition is 95; after the rubber composition is soaked in brake oil under the condition of 125℃x168H, the tensile elongation change is-17.8% (required to be≤-35%), and the volume change is 1.4% (required to be 0~+10%).

[0054] The outer rubber layer 103 rubber composition includes the following components in parts by weight: 100 parts of EPDM raw rubber, 20 parts of white carbon black, 65 parts of carbon black N550, 3 parts of stearic acid, 10 parts of zinc oxide, 1 part of insoluble sulfur, 4 parts of accelerator TBZTD, and 5 parts of phenolic adhesive resin.

[0055] The rubber composition has an adhesion to yarn of 24.3N / cm (required to be≥14N / cm).

[0056] Embodiment 2

[0057] The inner rubber layer 101 rubber composition includes the following components in parts by weight: 100 parts of EPDM raw rubber, 20 parts of liquid ethylene-propylene rubber, 90 parts of carbon black N550, 20 parts of white carbon black, 3 parts of antioxidant 445, 2 parts of stearic acid, 9 parts of 14-40B, and 5 parts of crosslinking aid TAIC.

[0058] The Mooney ML (1+4) 100℃ of the rubber composition is 85; after the rubber composition is soaked in brake oil under the condition of 125℃x168H, the tensile elongation change is-4.8% (required to be≤-35%), and the volume change is 0.9% (required to be 0~+10%).

[0059] The outer rubber layer 103 compound composition comprises the following components in parts by weight: 100 parts of EPDM raw rubber, 30 parts of white carbon black, 55 parts of carbon black N550, 4 parts of stearic acid, 3 parts of zinc oxide, 2 parts of insoluble sulfur, 4 parts of accelerator TBZTD, and 5 parts of phenolic adhesive resin.

[0060] The rubber composition has a yarn adhesion of 23.3 N / cm (required ≥ 14 N / cm).

[0061] Example 3

[0062] The inner rubber layer 101 compound composition comprises the following components in parts by weight: 100 parts of EPDM raw rubber, 15 parts of liquid ethylene-propylene rubber, 70 parts of carbon black N550, 40 parts of white carbon black, 1.5 parts of antioxidant 445, 1 part of stearic acid, 6 parts of 14-40B, and 8 parts of crosslinking aid TAIC.

[0063] The rubber composition has a Mooney ML (1+4) 100℃ of 89; after the rubber composition is soaked in brake oil at 125℃x168H, the tensile elongation change is -6.4% (required ≤-35%), and the volume change is 1.8% (required 0~+10%).

[0064] The outer rubber layer 103 compound composition comprises the following components in parts by weight: 100 parts of EPDM raw rubber, 40 parts of white carbon black, 45 parts of carbon black N550, 2 parts of stearic acid, 5 parts of zinc oxide, 1.5 parts of insoluble sulfur, 2 parts of accelerator TBZTD, and 7 parts of phenolic adhesive resin.

[0065] The rubber composition has a yarn adhesion of 26.9 N / cm (required ≥ 14 N / cm).

[0066] Comparative Example 1

[0067] The inner rubber layer 101 compound composition comprises the following components in parts by weight: 100 parts of EPDM raw rubber, 8 parts of paraffin oil, 90 parts of carbon black N550, 20 parts of white carbon black, 1.5 parts of antioxidant 445, 1 part of stearic acid, 6 parts of 14-40B, and 8 parts of crosslinking aid TAIC.

[0068] The rubber composition has a Mooney ML (1+4) 100℃ of 85; after the rubber composition is soaked in brake oil at 125℃x168H, the tensile elongation change is -7.6% (required ≤-35%), and the volume change is -3.5% (required 0~+10%).

[0069] The outer rubber layer 103 compound composition comprises the following components in parts by weight: 100 parts of EPDM raw rubber, no addition of white carbon black VN3, 85 parts of carbon black N550, 2 parts of stearic acid, 5 parts of zinc oxide, 1.5 parts of insoluble sulfur, 2 parts of accelerator TBZTD, and 7 parts of phenolic adhesive resin.

[0070] The rubber composition has a yarn adhesion of 11.6 N / cm (required ≥ 14 N / cm).

[0071] Comparative Example 2

[0072] The inner rubber layer 101 compound composition comprises the following components in parts by weight: 100 parts of EPDM raw rubber, 15 parts of liquid ethylene-propylene rubber, 90 parts of carbon black N550, 20 parts of white carbon black, 1.5 parts of antioxidant 445, 1 part of stearic acid, no addition of 14-40B, 2 parts of insoluble sulfur, and 8 parts of crosslinking aid TAIC.

[0073] The rubber composition has a Mooney ML (1+4) 100℃ of 88; and after soaking in brake oil at 125℃ x 168H, the change in elongation at break is -46% (required ≤ -35%), and the volume change is 2.1% (required 0~+10%).

[0074] The outer rubber layer 103 compound composition comprises the following components in parts by weight: 100 parts of EPDM raw rubber, 40 parts of white carbon black, 45 parts of carbon black N550, 2 parts of stearic acid, 5 parts of zinc oxide, 1.5 parts of insoluble sulfur, 2 parts of accelerator TBZTD, and no addition of phenolic adhesive resin.

[0075] The rubber composition has a yarn adhesion of 12.4 N / cm (required ≥ 14 N / cm).

[0076] From the above experimental results, it can be seen that:

[0077] The inner rubber examples 1, 2, and 3, because no plasticizer is added, liquid ethylene-propylene rubber is added, and peroxide vulcanization is used, the high temperature resistance and brake oil resistance of the compound are improved on the basis of ensuring the processing performance. Comparative Example 1 has unqualified brake oil resistance volume change because paraffin oil plasticizer is used, and Comparative Example 2 has a serious decrease in heat resistance because sulfur vulcanization is used.

[0078] The outer rubber examples 1, 2, and 3 greatly improve the adhesion of the compound to the yarn because white carbon black and adhesive resin are added to form an inter-metha-white adhesive system. Comparative Examples 1 and 2 have poor adhesion of the rubber to the yarn because no white carbon black or adhesive resin is added.

Claims

1. A hose for an automotive ABS master cylinder, characterized by, From inside to outside, the hose comprises an inner rubber layer, a middle skeleton layer and an outer rubber layer in sequence; The rubber material of the inner rubber layer comprises EPDM raw rubber, liquid ethylene-propylene rubber, carbon black N550, white carbon black, antioxidant 445, stearic acid, 14-40B and cross-linking aid TAIC; The middle skeleton layer is made of yarn weaving; The rubber material of the outer rubber layer comprises EPDM raw rubber, white carbon black, carbon black N550, stearic acid, zinc oxide, insoluble sulfur, accelerator TBZTD and phenolic adhesive resin; The rubber material of the inner rubber layer comprises 100 parts of EPDM raw rubber, 10-30 parts of liquid ethylene-propylene rubber, 60-90 parts of carbon black N550, 20-40 parts of white carbon black, 1-4 parts of antioxidant 445, 1-3 parts of stearic acid, 2-10 parts of 14-40B and 5-15 parts of cross-linking aid TAIC by weight; The rubber material of the outer rubber layer comprises 100 parts of EPDM raw rubber, 20-40 parts of white carbon black, 40-70 parts of carbon black N550, 1-4 parts of stearic acid, 3-10 parts of zinc oxide, 1-2 parts of insoluble sulfur, 1-4 parts of accelerator TBZTD and 5-10 parts of phenolic adhesive resin by weight.

2. The hose for an automotive ABS master cylinder according to claim 1, characterized by The Mooney ML of the compound of the inner rubber layer is 30 to 60 (1+4) 100°C is any one of 85 to 95.

3. The hose for an automotive ABS master cylinder according to claim 1, wherein The tensile elongation change of the rubber material of the inner rubber layer after soaking in brake oil at 125℃×168H is any value in the range of -20 to -4.0%, and the volume change is any value in the range of 0.5 to 2.0%.

4. The hose for an automotive ABS master cylinder according to claim 1, wherein The adhesion of the rubber material of the outer rubber layer to the yarn of the middle skeleton layer is any value in the range of 20 to 30 N / cm.

5. A tubing assembly characterized by, The application relates to a hose for an automobile ABS brake master cylinder and a hard pipe assembly connected with the hose.

6. The tubing assembly of claim 5, wherein, The hard pipe assembly comprises a hard pipe, a hard pipe core, a fastening sleeve and a connector; the two ends of the hard pipe are connected with the connectors, one end of the connector is connected with a brake master cylinder, and the other end of the connector is connected with a proportional distributor; the hard pipe core is arranged at the middle part of the hard pipe and sleeved with the hose; the fastening sleeve is sleeved with the two ends of the hose and connected with the hard pipe core.

7. The tubing assembly of claim 6, wherein, The two end outer sides of the hard pipe core are provided with reverse teeth, and the length of the hard pipe core provided with the reverse teeth is 55-65% of the total length of the hard pipe core.

8. The tubing assembly of claim 5, wherein, The pressure explosion resistance of the hard pipe assembly is not less than 80 MPa.

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