Application of wear-resistant rubber composition in preparation of bag skin for active air spring and active air spring

Abstract

The invention discloses an application of a wear-resistant rubber composition in preparation of a bag skin for an active air spring and the active air spring, the wear-resistant rubber composition comprises chloroprene rubber and a wear-resistant component, and the wear-resistant component comprises carbon black and powdery polyethylene powder; the iodine absorption value of the carbon black is 50-100mg / g, the oil absorption value of the carbon black is 80-110mL / 100g, the specific surface area of the carbon black is 50-110m < 2 > / g, and the addition amount of the carbon black is less than or equal to that of the polyethylene powder; the wear-resistant rubber composition disclosed by the invention can realize unexpected excellent performances such as high wear resistance, greatly improves the wear resistance between outer rubber layers of an air spring group, reduces the damage risk, can be applied to a bag skin for an active air spring, improves the structure of the active air spring, and improves the service life of the active air spring. The height and rigidity of the air spring body can be rapidly adjusted, an air compressor is not needed, and noise in the air compression process is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of vehicle suspension devices, in particular to an air suspension system and an air spring (air bag) used therein, and specifically to an application of a wear-resistant rubber composition in preparing a bladder skin for an active air spring and an active air spring. Background Art

[0002] There are many types of air springs available, and active air springs have become a major trend. Unlike conventional air springs, active air springs allow passengers to adjust different angles and stiffnesses according to different driving needs, which inevitably causes friction between the main and secondary air spring skins. If the outer rubber layer of the air spring skin has insufficient wear resistance and a large friction coefficient, the air spring skin is easily damaged by friction. Currently, most people use chloroprene rubber (CR) with good wear resistance as an improvement or combined rubber type, but due to increasingly harsh operating conditions, the wear resistance of chloroprene rubber alone is still insufficient, and the outer rubber layer of the air spring skin is often broken.

[0003] It should be noted that the information disclosed in the above background technology section is only used to understand the background of the present application, so the background technology section of the present invention may contain background information about the problem or environment of the present invention, but not necessarily describe the prior art. Therefore, the content contained in the background technology section is not an admission of the applicant to the prior art. Summary of the invention

[0004] The object of the present invention is to overcome one or more deficiencies in the prior art and to provide an improved wear-resistant rubber composition with high wear resistance for use in preparing an active air spring.

[0005] The present invention also provides an active air spring which is highly wear-resistant, can effectively reduce noise during air compression, does not require an acoustic package, effectively saves costs and can recover energy.

[0006] In order to achieve the above object, a technical solution adopted by the present invention is:

[0007] The invention discloses an application of a wear-resistant rubber composition in preparing a bladder skin for an active air spring, wherein the raw materials of the wear-resistant rubber composition include chloroprene rubber and a wear-resistant component, wherein the wear-resistant component includes carbon black and powdered polyethylene powder; wherein the carbon black has an iodine absorption value of 50-100 mg / g, an oil absorption value of 80-110 mL / 100 g, and a specific surface area of ​​50-110 m 2 / g, the added amount of the carbon black is less than or equal to the added amount of the polyethylene powder.

[0008] Another technical solution provided by the present invention is a wear-resistant rubber composition for an active air spring, wherein the raw materials of the rubber composition include chloroprene rubber and an additive, wherein the additive includes a vulcanizing agent, and in particular, the additive also includes a wear-resistant component, wherein the wear-resistant component includes carbon black and polyethylene powder; wherein the iodine absorption value of the carbon black is 50-100 mg / g, the oil absorption value is 80-110 mL / 100 g, and the specific surface area is 50-110 m 2 / g, the added amount of the carbon black is less than or equal to the added amount of the polyethylene powder.

[0009] According to some preferred aspects of the present invention, the carbon black has an iodine absorption value of 65-90 mg / g, an oil absorption value of 90-110 mL / 100 g, and a specific surface area of ​​60-110 m 2 / g.

[0010] Furthermore, the carbon black has an iodine absorption value of 75-88 mg / g, an oil absorption value of 95-108 mL / 100 g, and a specific surface area of ​​65-110 m 2 / g.

[0011] In the present invention, "iodine absorption value" is determined according to ASTM D1510-24;

[0012] "Oil absorption value" is determined according to ASTM D2414-01;

[0013] "Specific surface area" is determined according to ASTM D6556-19a.

[0014] In some embodiments of the present invention, the carbon black has an oxygen content of 0.5wt.%-1.0wt.%, and a hydrogen content of 0.27wt.%-0.34wt.%.

[0015] According to a specific aspect of the present invention, the carbon black is carbon black N330.

[0016] According to some preferred aspects of the present invention, the added amount of the wear-resistant component is 2.0 wt.%-12.0 wt.% in weight percentage.

[0017] Furthermore, in terms of weight percentage, the added amount of the wear-resistant component is 5.5wt.%-12.0wt.%.

[0018] In some embodiments of the present invention, the amount of the wear-resistant component added can be 2.5wt.%, 3.0wt.%, 3.5wt.%, 4.0wt.%, 4.5wt.%, 5.0wt.%, 6.0wt.%, 7.0wt.%, 7.5wt.%, 8.0wt.%, 8.5wt.%, 9.0wt.%, 9.5wt.%, 10.0wt.%, 10.5wt.%, 11.0wt.%, etc., calculated in weight percentage.

[0019] According to some preferred aspects of the present invention, the mass ratio of the carbon black to the polyethylene powder is 1:1-10.

[0020] Furthermore, the mass ratio of the carbon black to the polyethylene powder is 1:1-5.

[0021] In some embodiments of the present invention, the mass ratio of the carbon black to the polyethylene powder can be 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5, 1:5.5, 1:6, 7:1, 1:8, 1:9, etc.

[0022] According to some preferred aspects of the present invention, the particle size of the polyethylene powder is 20-150 μm.

[0023] According to some preferred aspects of the present invention, the weight average molecular weight of the polyethylene in the polyethylene powder is 3 million to 8 million.

[0024] In some embodiments of the present invention, the raw materials of the sizing composition include, by weight:

[0025] Neoprene 80-100 parts

[0026] Vulcanizing agent 1-5 parts

[0027] 4-20 parts of wear-resistant component.

[0028] In some embodiments of the present invention, the auxiliary agent further comprises a combination of one or more selected from the group consisting of a vulcanization accelerator, stearic acid, carbon black N770, and an antioxidant.

[0029] In some embodiments of the present invention, the vulcanizing agent includes magnesium oxide and zinc oxide, and the mass ratio of the magnesium oxide to the zinc oxide is 1:1.1-3.

[0030] Furthermore, the feed mass ratio of the magnesium oxide to the zinc oxide may be 1:1.5, 1:1.8, 1:2, 1:2.2, 1:2.5, etc.

[0031] According to some specific aspects of the present invention, the raw materials of the rubber composition include, by weight:

[0032] Neoprene 80-100 parts

[0033] Vulcanizing agent 1-5 parts

[0034] Wear-resistant component 4-20 parts

[0035] Stearic acid 0.5-3 parts

[0036] Carbon black N770 60-80 parts

[0037] Vulcanization accelerator 0.1-1.5 parts

[0038] 2-8 parts of antioxidant.

[0039] Furthermore, the raw materials of the rubber composition include, by weight:

[0040] 85-95 parts of chloroprene rubber

[0041] 2-4 parts of vulcanizing agent

[0042] Wear-resistant component 4-20 parts

[0043] Stearic acid 0.5-2 parts

[0044] Carbon black N770 60-75 parts

[0045] Vulcanization accelerator 0.1-1.0 parts

[0046] 4-8 parts of antioxidant.

[0047] In some embodiments of the present invention, the vulcanization accelerator includes but is not limited to accelerator NA-22 (Chinese name: 1,2-ethylenethiourea or ethylenethiourea).

[0048] In some embodiments of the present invention, the antioxidant includes but is not limited to antioxidant DTPD, antioxidant 4010NA, antioxidant 4020, etc.

[0049] Another technical solution provided by the present invention is a method for preparing the wear-resistant rubber composition for the active air spring, the preparation method comprising:

[0050] The chloroprene rubber, stearic acid, carbon black N770, wear-resistant components and antioxidant are mixed, the rubber material is discharged after mixing, cooled, and then added to an open mixing mill, a vulcanizing agent and a vulcanization accelerator are added, and thin-pass plastication is performed to obtain a wear-resistant rubber material composition for an active air spring.

[0051] Further, the mixing temperature is 60-80° C. According to some specific aspects of the present invention, the mixing temperature is 65-75° C.

[0052] In some embodiments of the present invention, the mixing is performed in an internal mixer, and the rotation speed of the internal mixer is 50-100 rpm, and further can be 60-80 rpm.

[0053] Furthermore, the discharge temperature of the discharged rubber material is 100-150°C.

[0054] Furthermore, the temperature in the open mill is 60-80°C.

[0055] In some embodiments of the present invention, the method for preparing the wear-resistant rubber composition for active air springs comprises:

[0056] a. Add the weighed chloroprene rubber into the internal mixer and mix for 0.5-5 minutes;

[0057] b. Add anti-aging agent and other small materials and mix for 0.5-5 minutes;

[0058] c. Add carbon black N770 and mix for 0.5-5 minutes;

[0059] d. Add the wear-resistant components and mix for 0.5-5 minutes;

[0060] e. The discharge temperature is controlled at 100-150℃, and the rubber is discharged after staying for 0.5-5min, and the mixing is completed;

[0061] f. After the mixed rubber material has cooled for 2-3 hours, place it on an open mixer and adjust the roller distance to the minimum, and add the vulcanizing agent and vulcanization accelerator;

[0062] g. Thin the sheet several times (for example, 2-3 times), and then cool the lower sheet.

[0063] Another technical solution provided by the present invention is: use of the above-mentioned wear-resistant rubber composition for active air springs in preparing a bladder skin for an active air spring.

[0064] Another technical solution provided by the present invention is a bladder skin for an active air spring, wherein the bladder skin for an active air spring is made by processing the above-mentioned wear-resistant rubber composition for an active air spring.

[0065] Furthermore, the processing includes vulcanization treatment, and the temperature of the vulcanization treatment is 160-170°C.

[0066] The present invention also provides another technical solution: an active air spring, the active air spring comprising an empty spring body, a medium tank for storing a pressure medium, and a first solenoid valve, the empty spring body comprising an empty spring piston, a main bladder skin and a secondary bladder skin respectively arranged on the empty spring piston, and a main cavity and a secondary cavity, the main cavity being connected to the medium tank through the first solenoid valve; when the amount of the pressure medium filled in the secondary cavity changes, the secondary bladder skin can be deformed and drive the main bladder skin to deform, thereby changing the stiffness of the empty spring body, in particular:

[0067] The active air spring also includes a boost valve and a second solenoid valve;

[0068] The boost valve comprises a chamber, a linkage piston arranged in the chamber and a reset member, wherein the linkage piston divides the chamber into a first chamber, a second chamber and a third chamber which are not connected to each other in the chamber, and the linkage piston can be displaced in the chamber and simultaneously change the volumes of the first chamber, the second chamber and the third chamber; the first chamber unidirectionally transports pressure medium to the medium tank, the second chamber unidirectionally transports pressure medium to the first chamber through a one-way valve arranged outside the chamber, the second chamber is further provided with an inlet for replenishing pressure medium, and the third chamber is connected to the auxiliary chamber through the second solenoid valve;

[0069] One, two or three of the first chamber, the second chamber and the third chamber are provided with the reset member, and the reset member is used to reset the linkage piston.

[0070] The general components of the air suspension system currently on the market include: air springs, air supply units, air storage tanks, medium tanks, ECUs, etc. The air supply unit is mainly composed of air compressors, acoustic packages, and other components. The air compressor pressurizes the air and discharges it into the medium tank, which provides high-pressure gas to the air spring to achieve lifting, and the acoustic package is used to reduce the noise generated during the operation of the air compressor. However, the air compressors in existing air suspension systems have the following problems: 1. There are many components and a complex structure; 2. The working noise is high and needs to be used with an acoustic package, which is relatively expensive; the above-mentioned solution of the present invention can solve these problems.

[0071] Furthermore, one or both of the main bladder skin and the auxiliary bladder skin are made of the bladder skin for the active air spring described above.

[0072] In some embodiments of the present invention, the main cavity is formed between the main bag skin and the outer side wall of the empty spring piston, the auxiliary bag skin is arranged on the outer side wall of the empty spring piston, a through hole is opened on the side wall of the empty spring piston, the auxiliary bag skin and the outer side wall of the empty spring piston and the inside of the empty spring piston are connected through the through hole to form the auxiliary cavity, and the main bag skin has a part that fits with the auxiliary bag skin.

[0073] According to some preferred and specific aspects of the present invention, the boost valve further comprises an upper valve body and a lower valve body connected to the upper valve body;

[0074] The linkage piston comprises a first piston whose circumference is sealed with the inner side wall of the upper valve body and can move up and down in the upper valve body, a second piston whose circumference is sealed with the inner side wall of the lower valve body and can move up and down in the lower valve body, and a linkage rod connected between the first piston and the second piston to link the first piston and the second piston;

[0075] The first chamber located above the first piston is formed in the upper valve body, and the second chamber and the third chamber are respectively formed in the lower valve body. The second chamber is located between the first piston and the second piston, and the third chamber is located below the second piston.

[0076] In some embodiments of the present invention, the linkage piston is movably arranged along a linear direction.

[0077] In some embodiments of the present invention, the first solenoid valve is capable of being connected to the atmosphere.

[0078] In some embodiments of the present invention, the reset element is a reset spring.

[0079] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0080] The present invention is based on the problems of poor wear resistance of existing rubber compositions for active air springs. After a large number of experimental studies, the inventor unexpectedly discovered that the combination of carbon black and polyethylene powder with unique iodine absorption value, oil absorption value and specific surface area can achieve unexpectedly high wear resistance and other excellent properties, greatly improve the wear resistance between the outer rubber layers of the active air spring group, and reduce the risk of breakage; after further mechanism research, it is analyzed that the unique iodine absorption value, oil absorption value and specific surface area give carbon black a specific surface chemical composition and a specific structural morphology. When combined with polyethylene powder and entering the fine gaps on the friction surface, it plays a sufficient role in reducing the friction coefficient, thereby improving the friction resistance of the bladder skin.

[0081] In addition, the improved active air spring provided by the present invention adopts the above-mentioned high wear-resistant rubber composition of the present invention, which greatly improves the service life and reduces the risk of damage to the bladder skin. Moreover, by improving the structure, the active air spring is also endowed with the functions of replenishing air, lifting, and lowering the height of the vehicle body without an air compressor and other power components, and realizes rapid adjustment of the height and stiffness of the air spring body and energy recovery. No air compressor and other power components are required, the noise during the air compression process is effectively reduced, and there is no need to use an acoustic package, which effectively saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 This is a photo of the bladder skin made of the rubber composition of Example 8 of the present invention after the compression tensile fatigue durability test;

[0083] Figure 2 This is a photo of the bladder skin made of the rubber composition of Example 9 of the present invention after the compression and tensile fatigue durability test;

[0084] Figure 3 This is a photo of the bladder skin made of the rubber composition of Comparative Example 2 of the present invention after the compression and tensile fatigue durability test;

[0085] Figure 4 This is a photo of the bladder skin made of the rubber composition of Comparative Example 3 of the present invention after the compression and tensile fatigue durability test;

[0086] Figure 5 This is a photo of the bladder skin made of the rubber composition of Comparative Example 4 of the present invention after the compression and tensile fatigue durability test;

[0087] Figure 6 Schematic diagram of the structure of the active air spring in Example 11 of the present invention;

[0088] Figure 6 In the figure markings: 1. air spring body; 101. main bladder skin; 102. auxiliary bladder skin; 103. air spring piston; 104. main chamber; 105. buckle base; 106. auxiliary chamber; 107. through hole; 2. second solenoid valve; 3. position sensor; 400. upper valve body; 401. linkage piston; 402. return spring; 403. first chamber; 404. first piston; 405. second chamber; 406. second piston; 407. third chamber; 408. linkage rod; 410. lower valve body; 501. first one-way valve; 502. second one-way valve; 503. third one-way valve; 6. inlet and outlet; 7. medium tank; 8. first solenoid valve. DETAILED DESCRIPTION

[0089] The above scheme is further described below in conjunction with specific embodiments; it should be understood that these embodiments are used to illustrate the basic principles, main features and advantages of the present invention, and the present invention is not limited to the scope of the following embodiments; the implementation conditions adopted in the embodiments can be further adjusted according to specific requirements, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0090] Unless otherwise specified in the following examples, all raw materials are commercially available or prepared by conventional methods in the art. Zinc oxide, zinc oxide, stearic acid, and accelerator NA-22 are all commercially available. Carbon black N770 is purchased from Cabot Corporation; carbon black N330 is purchased from Cabot Corporation; carbon black N110 is purchased from Cabot Corporation; carbon black N660 is purchased from Cabot Corporation; chloroprene rubber is purchased from Nippon Denka Co., Ltd., brand S40V; nitrile rubber, JSR Corporation, brand: N230S; antioxidant is antioxidant DTPD, purchased from Rhine; polyethylene powder is purchased from Nanjing Tengyi New Materials Technology Co., Ltd., brand UPE; polyethylene fiber (diameter: 10-25μm, length: 1-3mm, weight average molecular weight: 5 million-8 million) is purchased from DSM, brand UHMWPEF.

[0091] Embodiment 1-10:

[0092] The present embodiments provide a wear-resistant rubber composition for an active air spring and a preparation method thereof. The specific formula and raw materials are shown in Table 1.

[0093] Table 1

[0094]

[0095]

[0096] The preparation method of the wear-resistant rubber composition for the active air spring comprises:

[0097] a. Add the weighed chloroprene rubber into an internal mixer (temperature 70°C, speed 70 rpm) and mix for 1 min;

[0098] b. Add antioxidant and stearic acid and mix for 1 minute;

[0099] c. Add carbon black N770 and mix for 1 minute;

[0100] d. Add the wear-resistant components and mix for 1 minute;

[0101] e. The discharge temperature is controlled at 125±15℃, and the rubber is discharged after staying for 1 minute, and the mixing is completed;

[0102] f. After the mixed rubber material has cooled for 3 hours, it is placed on an open mixer (temperature is about 70°C), and the roller distance is adjusted to the minimum, and zinc oxide, magnesium oxide and accelerator NA-22 are added;

[0103] g. Thin the sheet three times and cool it to make a wear-resistant rubber composition for active air springs.

[0104] Comparative Example 1:

[0105] It is basically the same as Example 5, except that no wear-resistant component is added.

[0106] Comparative Example 2:

[0107] The method is basically the same as Example 5, except that the carbon black N330 is replaced by an equal amount of carbon black N110.

[0108] Comparative Example 3:

[0109] The method is basically the same as Example 5, except that the carbon black N330 is replaced by an equal amount of carbon black N660.

[0110] Comparative Example 4:

[0111] The method is basically the same as Example 5, except that the polyethylene powder is replaced with an equal amount of polyethylene fiber.

[0112] Comparative Example 5:

[0113] The method is basically the same as Example 5, except that no wear-resistant component is added and 12 parts of nitrile rubber are added.

[0114] Comparative Example 6:

[0115] The method is basically the same as Example 5, except that no wear-resistant component is added and 16 parts of nitrile rubber are added.

[0116] Performance Testing:

[0117] (1) Test 1

[0118] Test method (according to ASTM D1894-01):

[0119] 1. Use a 10mm stainless steel ball to make reciprocating motion on the test piece at a pressure of 5N, 10N, and 15N, with a stroke of 2cm and a frequency of 60Hz. Test for five minutes at each pressure and record the friction coefficient;

[0120] 2. Scan the wear scars and record the width and depth of the wear scars;

[0121] The specific results of the above Examples 1-10 and Comparative Examples 1-6 are shown in Tables 2 and 3.

[0122] Table 2

[0123]

[0124] Table 3

[0125]

[0126] (2) Test 2

[0127] Test method for flexion of rubber Demesia: GB / T13934-2006.

[0128] The specific results of the above Examples 5-10 and Comparative Examples 1-6 are shown in Table 4.

[0129] Table 4

[0130]

[0131] Note: When cracks appear after 12 million to 13 million tests, the mark is >12 million; when cracks appear after 10 million to 11 million tests, the mark is >10 million; when cracks appear after 4 million to 5 million tests, the mark is >4 million.

[0132] (3) Test 3

[0133] Test method:

[0134] The rubber compositions of the above-mentioned Examples 8-9 and Comparative Examples 1-6 are formed by conventional methods, such as by bonding an inner rubber layer, a cord layer and an outer rubber layer, vulcanized and formed, cut into finished bladder skins according to drawings, and then assembled to form air springs. The air springs are subjected to compression and tensile fatigue durability bench tests on a suspension fatigue testing machine without steering, (1) 17,980 tests at 80°C, repeated 10 times in total; (2) 17,980 tests at 60°C, repeated 10 times in total; (3) 17,980 tests at -30°C, repeated 10 times in total; (1) to (3) are repeated in sequence, with a total of 1,078,800 set times; the durability times and bladder skin conditions are recorded, and the specific results are shown in Table 5.

[0135] Table 5

[0136]

[0137] Among them, the capsule skin made of the rubber composition of Example 8, the photos after testing are shown in Figure 1 As shown, the capsule skin made of the rubber composition of Example 9, the photos after testing are shown in Figure 2 As shown, their surfaces are normal and no damage is found;

[0138] The capsule skins made of the rubber compositions of Comparative Examples 2-4, the photos after testing are respectively shown in Figures 3 to 5 As shown, it can be seen that there are obvious local damages on their surfaces.

[0139] Embodiment 11:

[0140] This example provides an active air spring, which includes an air spring body, a medium tank for storing pressure medium, and a first solenoid valve. The air spring body includes an air spring piston, a main bladder skin and a secondary bladder skin respectively arranged on the air spring piston, and a main cavity and a secondary cavity. The main cavity is connected to the medium tank through the first solenoid valve. When the amount of pressure medium filled in the secondary cavity changes, the secondary bladder skin can be deformed and drive the main bladder skin to deform, thereby changing the stiffness of the air spring body.

[0141] The active air spring also includes a boost valve and a second solenoid valve;

[0142] The booster valve comprises a chamber, a linkage piston arranged in the chamber and a reset member, wherein the linkage piston divides the chamber into a first chamber, a second chamber and a third chamber which are not connected to each other in the chamber, and the linkage piston can be displaced in the chamber and simultaneously change the volumes of the first chamber, the second chamber and the third chamber; the first chamber unidirectionally transports pressure medium to the medium tank, the second chamber unidirectionally transports pressure medium to the first chamber through a one-way valve arranged outside the chamber, the second chamber is also provided with an inlet for replenishing pressure medium, and the third chamber is connected to the auxiliary chamber through a second solenoid valve;

[0143] One, two or three of the first chamber, the second chamber and the third chamber are provided with a reset member, and the reset member is used to reset the linkage piston.

[0144] In this example, one or both of the main bladder skin and the auxiliary bladder skin are made of the above-mentioned active air spring bladder skin. Of course, in other embodiments, the main bladder skin and the auxiliary bladder skin can also be made of existing materials.

[0145] The boost valve also includes an upper valve body and a lower valve body connected to the upper valve body. The linkage piston includes a first piston whose circumference is sealed with the inner wall of the upper valve body and can move up and down in the upper valve body, a second piston whose circumference is sealed with the inner wall of the lower valve body and can move up and down in the lower valve body, and a linkage rod connected between the first piston and the second piston to link the first piston and the second piston; a first cavity is formed in the upper valve body and located above the first piston, and a second cavity and a third cavity are respectively formed in the lower valve body, the second cavity is located between the first piston and the second piston, and the third cavity is located below the second piston.

[0146] Further, see Figure 6As shown, the active air spring of this example includes: an air spring body 1, a first solenoid valve 8, a boost valve, a second solenoid valve 2, a first one-way valve 501, a second one-way valve 502, a third one-way valve 503, a position sensor 3, a buckle base 105, and a medium tank 7 for providing pressure medium to the air spring.

[0147] The air spring body 1 includes an air spring piston 103 with a cavity formed inside, a main bladder skin 101 and a secondary bladder skin 102 arranged on the air spring piston 103, a main cavity 104 is formed between the main bladder skin 101 and the outer wall of the air spring piston 103, the secondary bladder skin 102 is sleeved on the outer wall of the air spring piston 103, a through hole 107 is opened on the side wall of the air spring piston 103, the secondary bladder skin 102 and the outer wall of the air spring piston 103 and the inside of the air spring piston 103 are connected through the through hole 107 to form a secondary cavity 106, the main bladder skin 101 is partially in contact with the secondary bladder skin 102, when the amount of pressure medium filled in the secondary cavity 106 changes, the bulging secondary bladder skin 102 deforms and drives the main bladder skin 101 to deform, thereby changing the stiffness of the air spring body 1.

[0148] The first solenoid valve 8 is connected to the inlet and outlet 6 and is used to control the connection state between the pressure medium and the main chamber 104. The inlet and outlet 6 is connected to the atmosphere.

[0149] The boost valve includes: an upper valve body 400, a lower valve body 410, a linkage piston 401, and a return spring 402; the lower valve body 410 is connected to the upper valve body 400 when there is no obstruction from other parts, and the internal cavities of the upper valve body 400 and the lower valve body 410 are both cylindrical, and the cross-section of the internal cavity of the upper valve body 400 is smaller than the cross-section of the internal cavity of the lower valve body 410; the linkage piston 401 includes a first piston 404 whose circumference is sealedly connected to the inner side wall of the upper valve body 400 and moves up and down in the upper valve body 400, a second piston 406 whose circumference is sealedly connected to the inner side wall of the lower valve body 410 and moves up and down in the lower valve body 410, and a linkage rod 408 connected between the first piston 404 and the second piston 406 to link the first piston 404 and the second piston 406, the cavity in the upper valve body 400 and located above the first piston 404 is the first cavity 403, and the cavity between the first piston 404 and the second piston 406 is the first cavity 403. The cavity between the two pistons 406 is the second cavity 405, and the cavity in the lower valve body 410 and below the second piston 406 is the third cavity 407. The third cavity 407 is connected to the sub-cavity 106 through the second solenoid valve 2, and the second solenoid valve 2 controls the on-off of the sub-cavity 106 and the third cavity 407; the return spring 402 is arranged in the upper valve body 400 and / or the lower valve body 410, and is used to reset the linkage piston 401. In this embodiment, the return spring 402 is arranged in the first cavity 403 and is located above the first piston 404. The two ends of the return spring 402 are connected to the top of the first piston 404 and the inner top of the upper valve body 400; the return spring 402 is installed in the first cavity 403 to help the linkage piston 401 to reset quickly. Since the first cavity 403 is filled with air, it is convenient to install the return spring 402, while the third cavity 407 is filled with hydraulic oil, which brings inconvenience to the installation of the return spring 402.

[0150] The first one-way valve 501 is connected between the second chamber 405 and the inlet and outlet 6 and is connected only from the inlet and outlet 6 to the second chamber 405. The medium can be replenished in time into the second chamber 405 through the first one-way valve 501; the second one-way valve 502 is connected between the second chamber 405 and the first chamber 403 and is connected only from the second chamber 405 to the first chamber 403. The pressure medium in the second chamber 405 can be replenished to the first chamber 403 in time through the second one-way valve 502; the third one-way valve 503 is connected between the first chamber 403 and the medium tank 7 and is connected only from the first chamber 403 to the medium tank 7. The pressure medium in the first chamber 403 can be replenished to the medium tank 7 in time through the third one-way valve 503.

[0151] The first solenoid valve 8 is a three-position three-way solenoid valve, which has a first working position, a second working position and a third working position. The different working positions of the first solenoid valve 8 can match the different working states of the air spring, thereby realizing the rapid switching of different working states of the air spring; when the first solenoid valve 8 is in the first working position, the medium tank 7 flows unidirectionally to the main chamber 104, and the inlet and outlet 6 are disconnected; when the first solenoid valve 8 is in the second working position, the medium tank 7 is disconnected from the main chamber 104, and the inlet and outlet 6 are disconnected; when the first solenoid valve 8 is in the third working position, the main chamber 104 is disconnected from the medium tank 7, and the main chamber 104 is connected to the inlet and outlet 6.

[0152] The position sensor 3 is arranged in the upper valve body 400 or the lower valve body 410 and is used to detect the position of the linkage piston 401. The position sensor 3 is convenient for detecting the position of the linkage piston 401, and further convenient for real-time control of the stiffness of the air spring body 1; the buckle base 105 is arranged at the bottom of the main bladder skin 101, and a main cavity 104 is formed between the outer side surfaces of the buckle base 105, the main bladder skin 101 and the lower end of the air spring piston 103.

[0153] The pressure medium in the medium tank 7, the main cavity 104, the first cavity 403 and the second cavity 405 is air, and the pressure medium in the auxiliary cavity 106 and the third cavity 407 is air or hydraulic oil. The density of the pressure medium in the medium tank 7, the main cavity 104, the first cavity 403 and the second cavity 405 is less than the density of the pressure medium in the auxiliary cavity and the third cavity. In this embodiment, the pressure medium in the auxiliary cavity 106 and the third cavity 407 is hydraulic oil. The use of hydraulic oil and air as two pressure media can quickly achieve the adjustment of the height and stiffness of the air spring body 1.

[0154] Based on the above active air spring control method, it includes the following steps:

[0155] Step 1. Fill the main chamber 104 with 10 bar ± 0.5 bar of compressed air to meet the stiffness and height requirements of the air spring body 1, and fill the auxiliary chamber 106 and the third chamber 407 with hydraulic oil. When the second solenoid valve is disconnected and the hydraulic oil fills the auxiliary chamber 106, the outer contour of the auxiliary bag skin 102 provides support for the movement of the main bag skin 101; when the vehicle moves, the buckle base 105 moves up and down, and the main bag skin 101 moves up and down close to the outer contour of the auxiliary bag skin 102. The main bag skin 101 squeezes the auxiliary bag skin 102 to different degrees at different movement heights, and the hydraulic oil circulates back and forth in the auxiliary chambers 106 on both sides of the through hole 107 to achieve shock absorption under normal road conditions;

[0156] Step 2. When it is necessary to switch to the medium tank 7 gas replenishment state, the second solenoid valve 2 is opened. During the movement of the vehicle, when the air spring body 1 is compressed, the squeezing force of the main bag skin 101 on the auxiliary bag skin 102 increases, and the hydraulic oil is squeezed from the auxiliary chamber 106 into the third chamber 407. The linkage piston 401 moves upward under the pressure of the hydraulic oil, and the return spring 402 is compressed. The gas in the second chamber 405 is compressed and supplied to the first chamber 403 through the second one-way valve 502, and the high-pressure gas enters the medium tank 7 through the third one-way valve 503; When the air spring body 1 is stretched, the main bag skin 101 moves downward, and the extrusion force and extrusion area on the auxiliary bag skin 102 are reduced. Under the elastic force of the return spring 402, the linkage piston 401 squeezes the hydraulic oil in the third chamber 407 back to the additional third chamber 407, and repeats this process for many times. The medium tank 7 is filled with gas during the movement of the car. After the gas filling of the medium tank 7 is completed, the second solenoid valve is disconnected, the return spring 402 returns to a free state, the linkage piston 401 stops reciprocating motion, and the gas no longer enters the medium tank 7 through the booster valve;

[0157] Step 3. When it is necessary to switch to lifting the empty spring body 1, the first solenoid valve 8 needs to be switched to the first working position, so that the high-pressure gas is transported from the medium tank 7 to the empty spring body 1, so that the height of the empty spring body 1 is raised;

[0158] Step 4. When it is necessary to switch to lowering the air spring body 1, the first solenoid valve 8 is switched to the third working position, and the air spring body 1 is connected to the atmosphere to release air;

[0159] Step 5. When the stiffness of the air spring body 1 needs to be adjusted, the second solenoid valve 2 is opened, and the first solenoid valve 8 is in the second working position. When the vehicle is in motion, the linkage piston 401 moves up and down, and the position sensor 3 can detect the position of the linkage piston 401 in the booster valve body. When the linkage piston 401 is in an upward position, the second solenoid valve 2 is closed, the amount of hydraulic oil in the air spring piston 103 is reduced, the outer contour diameter of the auxiliary bag skin 102 is reduced, and the stiffness of the air spring body 1 becomes lower. Otherwise, the stiffness of the air spring body 1 can be increased.

[0160] Steps 2 to 5 are in no particular order.

[0161] In summary, the present invention can realize the functions of replenishing air, lifting, and lowering the height of the vehicle body without an air compressor, and can utilize the switching of the first solenoid valve and the second solenoid valve, in coordination with the actions of the first one-way valve, the second one-way valve, the third one-way valve, and the boost valve, to realize rapid adjustment of the height and stiffness of the air spring body and energy recovery. No air compressor is required, the structure is reduced, the noise during the air compression process is effectively reduced, and there is no need to use an acoustic package, which effectively saves costs.

[0162] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

[0163] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

Claims

1. Application of a wear-resistant rubber composition in preparing a bladder skin for an active air spring, characterized in that: The raw materials of the wear-resistant rubber composition include chloroprene rubber and a wear-resistant component, wherein the wear-resistant component includes carbon black and powdered polyethylene powder; wherein the iodine absorption value of the carbon black is 50-100 mg / g, the oil absorption value is 80-110 mL / 100 g, and the specific surface area is 50-110 m 2 / g, the added amount of the carbon black is less than or equal to the added amount of the polyethylene powder.

2. The use according to claim 1, characterized in that: The particle size of the polyethylene powder is 20-150 μm; and / or the weight average molecular weight of the polyethylene in the polyethylene powder is 3 million to 8 million.

3. The use according to claim 1, characterized in that: The mass ratio of the carbon black to the polyethylene powder is 1:1-10; and / or the carbon black has an iodine absorption value of 65-90 mg / g, an oil absorption value of 90-110 mL / 100 g, and a specific surface area of ​​60-110 m 2 / g; and / or, in terms of weight percentage, the amount of the wear-resistant component added is 2.0wt.%-12.0wt.%.

4. The use according to claim 3, characterized in that: The mass ratio of the carbon black to the polyethylene powder is 1:1-5; and / or the carbon black has an iodine absorption value of 75-88 mg / g, an oil absorption value of 95-108 mL / 100 g, and a specific surface area of ​​65-110 m 2 / g; and / or, the oxygen content of the carbon black is 0.5wt.%-1.0wt.%, and the hydrogen content is 0.27wt.%-0.34wt.%.

5. The use according to claim 1, characterized in that: The carbon black is carbon black N330; and / or, in terms of weight percentage, the added amount of the wear-resistant component is 5.5wt.%-12.0wt.%.

6. The use according to claim 1, characterized in that: The raw materials of the wear-resistant rubber composition also include a vulcanizing agent. In parts by weight, the raw materials of the wear-resistant rubber composition include: Neoprene 80-100 parts Vulcanizing agent 1-5 parts 4-20 parts of wear-resistant components; The vulcanizing agent comprises magnesium oxide and zinc oxide, and the mass ratio of the magnesium oxide to the zinc oxide is 1:1.1-3; And / or, the raw materials of the wear-resistant rubber composition further include one or more combinations selected from vulcanization accelerator, stearic acid, carbon black N770, and antioxidant.

7. The use according to claim 1, characterized in that: The raw materials of the wear-resistant rubber composition include, by weight: Neoprene 80-100 parts Vulcanizing agent 1-5 parts Wear-resistant component 4-20 parts Stearic acid 0.5-3 parts Carbon black N770 60-80 parts Vulcanization accelerator 0.1-1.5 parts 2-8 parts of antioxidant; The preparation method of the wear-resistant rubber composition comprises: The chloroprene rubber, stearic acid, carbon black N770, wear-resistant components and antioxidant are mixed, the rubber material is discharged after mixing, cooled, and then added to an open mixing mill, a vulcanizing agent and a vulcanization accelerator are added, and thin-pass plastication is performed to obtain a wear-resistant rubber material composition.

8. A bladder skin for an active air spring, characterized in that: The bladder skin for the active air spring is made by using the wear-resistant rubber composition in the application described in any one of claims 1 to 7.

9. An active air spring, comprising an empty spring body, a medium tank for storing a pressure medium, and a first solenoid valve, wherein the empty spring body comprises an empty spring piston, a main bladder skin and a secondary bladder skin respectively arranged on the empty spring piston, and a main cavity and a secondary cavity, wherein the main cavity is connected to the medium tank through the first solenoid valve; when the amount of the pressure medium filled in the secondary cavity changes, the secondary bladder skin can deform and drive the main bladder skin to deform, thereby changing the stiffness of the empty spring body, characterized in that: The active air spring also includes a boost valve and a second solenoid valve; The boost valve comprises a chamber, a linkage piston arranged in the chamber and a reset member, wherein the linkage piston divides the chamber into a first chamber, a second chamber and a third chamber which are not connected to each other in the chamber, and the linkage piston can be displaced in the chamber and simultaneously change the volumes of the first chamber, the second chamber and the third chamber; the first chamber unidirectionally transports pressure medium to the medium tank, the second chamber unidirectionally transports pressure medium to the first chamber through a one-way valve arranged outside the chamber, the second chamber is further provided with an inlet for replenishing pressure medium, and the third chamber is connected to the auxiliary chamber through the second solenoid valve; One, two or three of the first chamber, the second chamber and the third chamber are provided with the reset member, and the reset member is used to reset the linkage piston; One or both of the main bladder skin and the auxiliary bladder skin are made of the bladder skin for an active air spring according to claim 8.

10. The active air spring according to claim 9, characterized in that: The boost valve further comprises an upper valve body and a lower valve body connected to the upper valve body; The linkage piston comprises a first piston whose circumference is sealed with the inner side wall of the upper valve body and can move up and down in the upper valve body, a second piston whose circumference is sealed with the inner side wall of the lower valve body and can move up and down in the lower valve body, and a linkage rod connected between the first piston and the second piston to link the first piston and the second piston; The first chamber located above the first piston is formed in the upper valve body, and the second chamber and the third chamber are respectively formed in the lower valve body. The second chamber is located between the first piston and the second piston, and the third chamber is located below the second piston.

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