SAE J 140 1 is the test standard of hydraulic brake hose used in the hydraulic system of road vehicles. SAE J 140 1 also points out the standard method to distinguish major manufacturers. This edition of the standard is J 140 1-2003, and the following figures indicate the year when the latest revision of the standard was adopted.
Original English version of SAE J 140 1
1. range
This SAE standard specifies the performance test and requirements of the hydraulic brake hose assembly used in the hydraulic brake system of road vehicles. It also specifies the method used to identify the hose manufacturer. ?
This document applies to the brake hose assembly, which is made of yarns and hoses made of natural or synthetic elastomers, and is equipped with metal end fittings for non-petroleum-based brake fluids specified in SAE J 1703 and SAE J 1705.
The nominal inner diameter of the brake hose shall be within the following values:
A.3.5 mm or less (1/8 inches or less)
B 4 to 5 mm (3/ 16 inch)
Step 2 refer to
2. 1 applicable publications-The following publications form a part of this specification within the scope specified herein. Unless otherwise specified, the latest edition of SAE publications shall be used.
2. 1. 1 publications of the American Society of Automotive Engineers-available from the American Society of Automotive Engineers at 400 Federal Avenue, Wallendale, Pennsylvania, 15096-000 1. ?
Sae j1703-motor vehicle brake fluid
Sae j1705-brake fluid with low water resistance
2. 1.2 ASTM publications-available from ASTM atNo. 100, bar harbor Avenue, West Kangshe Huoken, Pennsylvania, and zip code: 19428-2959.
Astm b117-salt spray test method
2. 1.3 ISO publication-available from American National Standards Institute at West 42nd Street 1 1 new york, NY.
Continued O R 147—— Load calibration of testing machine for steel tensile test
2.2 Related publications—The following publications are for reference only and are not a necessary part of this document.
2.2. 1 SAE publication-available from American society of automotive engineers, 400 federal avenue, warrendale, Pennsylvania, zip code: 15096-000 1.
SAE J1288-Packaging, Storage and Shelf Life of Hydraulic Brake Hose Components
SAE j 1406—— Application of Hydraulic Brake Hose in Motor Vehicles
2.2.2 ISO publications-available from ANSI at West 42nd Street 1 1, new york, NY 10036-8002.
х 3996-Flexible Pipe Components for Hydraulic Actuation-Hydraulic Oil Standard for Non-Stone Oil Flexible Pipe
3. Definition
3. 1 Brake hose assembly-Brake hose with end fittings for the brake system.
3.2 Brake Hose-Flexible conduit for brake system is manufactured to transmit and contain fluid pressure medium used to apply force to vehicle brakes.
3.3 Brake Hose End Fitting-A coupling designed to connect to the end of a brake hose, not a clamp.
3.4 Permanent Connection End Fittings-Couplings designed to be permanently connected to the end of a brake hose by crimping or squeezing.
3.5 Free length-The linear measurement of the brake hose exposed between the end fittings of the brake hose assembly when held in a straight position.
3.6 Leakage, Burst-Loss of test fluid from the brake hose assembly except the designed inlet and outlet.
3.7 Cracking-Surface interruption due to environment and/or stress.
3.8 Inner Diameter of Hose-A dimensional description of the nominal inner diameter printed on the hose cover. This size is used to calculate the gauge size of shrinkage test.
Example-3 mm
4. Performance test
The performance test of hydraulic brake hose assembly includes all the tests listed in table 1. These tests shall be carried out on each inner diameter size and model 1 of each hose manufacturer. The change of hose structure, that is, the change of material or manufacturing method, should require a complete performance test. Therefore, each connector should be tested for the performance of each connector crimping design of each hose structure. The change of coupling crimping design requires a complete performance test. Changes that do not affect the integrity of hose joints, such as changes in thread size, port size, hexagonal size, etc., should not be regarded as new designs. The sample size listed in table 1 represents the minimum amount for production process verification. The manufacturer of hydraulic brake hose assemblies is responsible for proper design verification exercises and controlling the production process, so that any hose assemblies sold or used in vehicles can meet the performance requirements listed in Table 1, and the tests are conducted according to the procedures and conditions described in 4. 1 and 4.2.
4. 1 test conditions
The components of each performance test shall be new and unused, and shall exist for at least 24 hours. The temperature shall be 15 to 32 C (60 to 90°F) for the last 4 hours before the test. Before installing the hose assembly on whipping or cold bending test, remove all external accessories, such as mounting bracket, spring protector and metal collar, or shorten the long pipe, or both. For all tests except brake fluid compatibility, cold bending, thermal shock, ozone, dynamic ozone, salt spray and water absorption, the temperature of the laboratory should be between 15 and 32 C (60 and 90°F). SAE recommends that brake fluid RM 66-05 be used for all tests requiring brake fluid. Different test results may be obtained by using different fluids.
4.2 test procedures
4.2. 1 100% pressure test-The hose assembly shall be subjected to pressure test, using inert gas, air, water or brake fluid as the pressure medium. Brake fluid shall comply with SAE J 1703/J 1705. For inert gas and air, the minimum test pressure should be 10.3 MPa (1500 psi), the maximum test pressure should be 14.5 MPa (2 100 psi), and the minimum test pressure should be 20.7 MPa (3000 psi) for water and non-petroleum-based hydraulic brake fluid. Special care should be taken when using gas or air. Under the specified pressure, if the hose or hose assembly fails, gas or air will explode. The pressure shall be maintained at not less than 10 and not more than 25 s.
4.2.2 Shrinkage test-For qualification and laboratory test, the shrinkage of the hose assembly shall be measured with a gauge plug as shown in figure 1. Fix the assembly vertically on the fitting, and insert the "A" diameter part of the necking gauge into the end of the fitting. Let the pressure gauge fall by its own weight over the whole length of the probe. The time required for the measuring tool to fall should not exceed 5s. Repeat this step for the other end of the brake hose assembly <
Some accessories are designed so that the gauge plug cannot be inserted from the outside. For these components, insert a special elongated gauge plug into the opposite fitting, and pass the probe through the hose, into and through the crimping area of the tested fitting. If the gauge plug is misaligned at the entrance of the second connector, it may be necessary to align the hose to allow the gauge plug to pass through. The special gauge plug shall meet all the requirements in Figure 1, except the length of 76 mm (3 in), and its length must be appropriately increased so that its tip extends beyond the hose opening. Some brake hose assemblies have joints at both ends, brackets and/or in the middle, and cannot be inserted with plug gauges. Cut these components 50 mm and 3 mm (2 in 0. 1 in) from the end of the joint, and then test them with a plug gauge. (Refer to table 1, footnote 2).
4.2.3 Volume expansion test-The expansion test aims to measure the volume expansion of the free length of the assembled hydraulic brake hose under the specified internal pressure through fluid displacement. Water or SAE standard brake fluid RM 66-05 should be used as the pressure medium.
4.2.3. 1 If the sample used in this test has been subjected to a pressure of more than 20 MPa (2900 psi) by any medium before this test, it is allowed to recover 15 minutes.
4.2.3.2 carefully screwed the hose assembly into the adapter, and the sealing method of the adapter was the same as that in actual use. Don't twist it. Under pressure, keep the hose in a vertical and straight position without tension.
4.2.3.3 exhausts all air in the system by letting about 0.25 L (0.5 pt) of brake fluid or water flow through the hose assembly and into the burette. Moving the hose back and forth helps to remove bubbles. Close the valve of burette and apply 20.0 MPa +0? 0. 14 MPa (2900 psi+0,20 psi) is connected to the hose assembly. Within 10 second, check whether there is any leakage at the joint of the hose assembly, and then completely release the pressure in the hose. Adjust the brake fluid or water level in the burette to zero. Close the valve leading to the burette and apply 6.9 MPa +0? 0. 14 MPa (1000 psi+0,20 psi) and seal the pressure in the hose within 5s 3 s. Within 3s, open the valve leading to the burette 10 s +3? Let the brake fluid or water level in the expansion hose rise in the burette. During this time, the brake fluid or water level in the burette should be kept constant.
4.2.3.4 repeats the previous steps twice, so that the amount of brake fluid or water in the burette will be the sum of the three expansions. Measure the burette reading to the nearest 0.05 cm3.
4.2.3.5 volume expansion is calculated by dividing the burette reading by three and subtracting the calibration coefficient. This number divided by the free length in meters (feet) will give the volume expansion per meter (feet) of hose.
As mentioned above, 4.2.3.6 readjusted the brake fluid or water level in the burette to zero, and repeated the procedure to obtain a pressure of 10.3 MPa +0? 0. 14 MPa (1500 psi+0,20 psi) and 20 psi+0,0.14 psi (2900 psi+0,0,20 psi) If the pressure in the hose unexpectedly rises above the specified value, but does not exceed 24 MPa (3500 psi), completely release the pressure, let the hose recover at least 15 min, and then repeat the test. If the pressure on the hose is higher than 24 MPa (3500 psi), repeat the test with a new brake hose. If bubbles flow out of the hose during the test, repeat the test after the hose has recovered for at least 3 minutes.
4.2.3.7 test instruments-test instruments shall mainly include the following contents:
A. The source of the required fluid pressure. The test fluid consists of brake fluid or water, and does not contain any additives, air or bubbles.
B containers for pressure gauges and accessories, in which hose assemblies can be installed vertically to apply pressure under controlled conditions.
C. graduated burette with increments of 0.05 cm3 for measuring the liquid volume corresponding to the expansion of the hose under pressure.
D. required piping hardware.
All pipes and connections shall be smooth holes without grooves or offset, so that all air can be freely exhausted from the system before each test. Valves should be able to withstand relevant pressures without leakage. See figure 2.
4.2.3.8 calibration of the instrument-The instrument shall be tested before use to determine its calibration correction coefficient. These correction factors should be determined at pressures of 6.9, 10.3 and 20 MPa (1000, 1500 and 2900 psi) by using an assembly with a minimum wall thickness of 1.52 mm (0.060 in) and a free length of. In the case of special end configuration, this may require connecting the pipe to the brake hose fitting. The calibration correction factor shall be subtracted from the expansion reading obtained on the sample. Under the pressure of 10.3 MPa (1500 psi), the maximum allowable calibration correction factor shall be 0.08cm3..
4.2.4 Burst strength test-Connect the sample to the pressure system and completely fill it with water or brake fluid RM 66-05 recommended by SAE, so that all air can be exhausted. Moving the hose back and forth helps to remove bubbles. Apply 27.6 MPa +0,? 1.4 MPa (4000 psi+0,200 psi) and hold for 2 minutes. 10 s。 At the end of the retention period, increase the pressure at the rate of172.5 MPa/min 69 MPa/min (25000 psi/min10000 psi/min) until the hose bursts. Read the maximum pressure obtained on the calibration pressure gauge, accurate to 1 MPa (100 psi), and record the bursting strength of the hose assembly.
4.2.4. 1 test instrument-The instrument shall be composed of a suitable pressure system, which is connected with a hose so that controlled and measured fluid pressure can be applied internally. The pressure shall be obtained by manual or electric pump or accumulator system, and shall be measured by calibration instrument. Be prepared to fill the hose with water or brake fluid before applying pressure, and allow all air to escape through the safety valve. This is an important security measure. The holding pressure and blasting pressure should be increased at the rate of172.5 MPa/min 69 MPa/min (25000 psi/min10000 psi/min). Because this type of hose can withstand the minimum bursting pressure of 49 MPa (7000 psi) of 3.2 mm (1/8 inch) and 34.5 MPa (5000 psi) of 4.8 mm (3/ 16 inch), it is necessary to pay attention to the adequacy of all pipes, valves and fittings. When the instrument described in the expansion test meets these requirements, it can be used.
4.2.5 Brake fluid compatibility, shrinkage and burst strength test
4.2.5. 1 Connect a hose assembly or a manifold that can connect multiple hose assemblies under a 0.5-liter (1 point) tank containing 100 ml SAE recommended brake fluid SAE RM 66-05 (see Figure 3).
4.2.5.2 filled the hose assembly with SAE referee brake fluid RM 66-05, sealed the lower end, and placed the test assembly vertically in the oven.
4.2.5.3 adjusts the hose assembly at 120℃ +5℃. 0°C(248°F+9，？ 70 to 72 hours.
After the 4.2.5.4 thermal aging period, remove the hose assembly and cool it at room temperature for 30 minutes plus or minus 5 minutes.
4.2.5.5 discharges the brake hose assembly, and within 10 minutes, determine that each applicable diameter of the hose assembly is not less than that shown in Figure 1 according to 4.2.2.
Using the test specified in 4.2.4, the 4.2.5.6 brake hose assembly shall burst within 3 hours.
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