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GB 7128-2008: [GB/T 7128-2008] Automotive air brake hose and hose assemblies
Status: Valid GB 7128: Evolution and historical versions
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[GB/T 7128-2008] Automotive air brake hose and hose assemblies
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GB 7128-2008
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| GB 7128-1986 | English | 199 |
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Rubber hose for automotive air brake system
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PDF similar to GB 7128-2008
Basic data | Standard ID | GB 7128-2008 (GB7128-2008) | | Description (Translated English) | [GB/T 7128-2008] Automotive air brake hose and hose assemblies | | Sector / Industry | National Standard | | Classification of Chinese Standard | G42 | | Classification of International Standard | 43.040.40; 83.140.40 | | Word Count Estimation | 12,143 | | Date of Issue | 2008-09-18 | | Date of Implementation | 2009-09-01 | | Older Standard (superseded by this standard) | GB 7128-1986 | | Quoted Standard | GB/T 1690-2006; GB/T 5563; GB/T 10125; GB/T 14905 | | Adopted Standard | SAE J1402-2005, NEQ | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 16 of 2008 (No. 129 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Chinese standard applies to reinforced elastomer layer coupled with a suitable hose and hose fittings manufactured air brake hose assemblies for the minimum requirements. This standard applies to automotive air brake systems, including the possible presence of air pressure 1MPa tensile and impact of the frame and axle, tractor and trailer, and other soft connection unprotected pipeline pressure hose assemblies for use. Hose for temperature range -40��C ~ +100��C environmental requirements (internal or external). | GB 7128-2008: [GB/T 7128-2008] Automotive air brake hose and hose assemblies---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Automotive air brake hose and hose assemblie
ICS 43.040.40; 83.140.40
G42
National Standards of People's Republic of China
Replacing GB 7128-1986
Automotive air brake hose and hose assemblies
Published 2008-09-18
2009-09-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China issued
Foreword
6.1.2,6.1.3,6.1.4 of this standard is mandatory, the rest are recommended.
This standard is not equivalent SAEJ1402.2005 "(R) Automotive air brake hose and hose assemblies."
This standard is based on SAEJ1402. redrafted 2005. For ease of comparison, the national standards are listed in this article in the informative Appendix A
List of control models and SAE standard terms.
This standard SAEJ1402. The main difference 2005.
--- modify the specifications 6.3,11.5,12.5SP, 12.5 to 6,12,13SP, 13, and increased the size 15;
Chapter 3 --- modifications within the hose section, the outer diameter (Table 1);
--- amend the provisions of Chapter 6 identifies the part, and finally transferred to this standard logo in Chapter 8;
--- deleted 1.1 bar will explain some of the terms of this standard to join the preface;
--- deleted Table 1 Inch specifications.
Instead of the standard GB 7128-1986 "automotive air brake hose."
The main difference between this standard and GB 7128-1986 are.
--- This standard is modified using SAEJ1402.2005, GB 7128-1986 are employed with reference to Japanese Industrial Standard JISD2606-
1980, restructuring large, and project performance parameters vary greatly;
--- Inner diameter specifications of the original standard was changed to 10, 13 5,6,8,10,11,12,13SP, 13,15,16 nominal size (edition of 1986
1.2; edition, Chapter 3);
--- increased hose structure, Type A, Type AⅠ, AII type is defined (edition chapter 3);
--- increased vehicle installation recommended minimum bend radius (edition Chapter 5);
--- removed the hose appearance requirements, acceptance regulatory provisions (Chapter 4 version 2.11 and 1986);
--- deleted packaging, shipping, storage requirements (version 1986 5.2,5.3,5.4,5.5 and 5.6), an increase of the assembly of identification requirements
(Edition 8.2).
Appendix A of this standard is an informative annex.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Technical Committee of Standardization and rubber hoses rubber Technical Committee (SAC/TC35/SC1).
This standard is drafted. Car Group in Nanjing seven thousand four hundred twenty-five factory.
Participated in the drafting of this standard. Guangzhou Tianhe Hose Co., Ltd.
The main drafters. Sun Kejian, Zhang Ying stable, Chen Runming, Pan Yanqin.
This standard previously issued as follows.
--- GB 7128-1986.
Automotive air brake hose and hose assemblies
Range 1
This standard specifies the minimum reinforcing layer of elastomeric air brake hose and hose assembly coupled with suitable hose couplings manufactured
Claim.
This standard applies to automotive air brake system, including tensile and impact may be present frame and the shaft of the air pressure of 1MPa, traction
Flexible hose assemblies connected to the vehicle trailer and a pneumatic line without protective used. Hose suitable temperature range of -40 ℃ ~
+ Environmental requirements (internal or external) of 100 deg.] C.
2 Normative references
Terms of the following documents become provisions of this standard by reference in this standard. For dated reference documents, all later
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to agreements based on this standard
Whether the latest versions of these documents. For undated references, the latest version applies to this standard.
GB/T 1690-2006 Rubber, vulcanized or thermoplastic liquid resistant test methods (ISO 1817.2005, MOD)
GB/T 5563 Rubber and plastics hoses and hose assemblies Hydrostatic testing (GB/T 5563-2006, ISO 1402.
1994, IDT)
GB/T 10125 artificial atmosphere corrosion test Salt spray test (GB/T 10125-1997, eqv ISO 9227.1990)
GB/T 14905 Rubber and plastics hoses between layers of adhesive strength was measured (GB/T 14905-1994, eqv ISO 8033.1991)
3 hose structure and size
Automobile air brake hoses have three different structures. All specifications are listed in Table 1.
A type of an elastic body layer, and a fiber reinforced elastomer outer layer coating composition;
An elastic body AⅠ type outer layer, and a layer of wire or reinforcing fiber woven fiber coating composition;
AⅡ type of an elastic body layer, wire or fiber-reinforced layer and a fibrous woven or elastomeric outer coating layers, the size of the hose see
SAEJ517100R5, equivalent thereto.
Table 1 A, and the inner diameter AⅠ AⅡ hose and an outer diameter in millimeters
Nominal
size
A type AⅠ inner diameter and an inner diameter AⅡ type Type A Type outer diameter of the outer diameter AⅠ outer diameter type AⅡ
Min Max Min Max Min Max Min Max Min Max
5 4.7 5.4 4.8 5.5 10.0 12.0 12.0 13.0 12.7 13.7
6 5.5 6.6 6.1 6.9 12.0 16.7 13.6 14.6 14.3 15.3
8 7.3 8.5 7.9 8.7 14.5 18.3 15.1 16.2 16.7 17.6
10 10.3 9.1 - - 16.5 19.8 - - - -
10.3 11.9 10.3 11.1 11 17.0 20.5 18.1 19.3 18.9 20.0
12 11.2 12.4 - - 18.0 21.4 - - - -
13SP 11.9 13.5 - - 20.0 23.5 - - - -
13 - - 12.7 13.7 - - 20.5 21.7 22.8 24.0
15 14.2 15.7 - - 23.0 26.8 - - - -
16 15.1 16.7 15.9 17.0 24.0 27.8 23.7 24.9 26.8 28.0
NOTE. If required, the sizes 10, 12 and 13SP A hose fitting can be assembled wild-type connector, but with the assembly-type connectors and AⅡ type AⅠ
Use different hose.
4 connector
4.1 permanent joint
Permanent joint when the hose fitting, the hose assembly of the hose to comply with Table 1, A, and size requirements AⅠ AⅡ type hose.
4.2 wild-type connector assembly
When the hose assembly wild-type connector assembly, the hose of hose assemblies shall comply AⅠ table and a variety of hose AⅡ
Shall comply with size requirements or Table 1 A hose 10, 12 and 13SP size requirements specifications. Wild-type connector assembly and with AⅠ AⅡ
Different type of hose used.
5 minimum bend radius
Table 2 lists the recommended vehicle mounting minimum bend radius.
TABLE 2 Recommended minimum bending radius in millimeters
Nominal size minimum bend radius (curved inside)
13SP 100
6 Performance
Note 1. All except bear one or two test samples to verify the performance of and length than the pressure change test and after the test should be destroyed in the analysis is complete.
Note 2. bursting strength test and the tensile strength assembly is to identify test, does not mean that the hose assemblies can be used under those conditions.
6.1 Performance Acceptance
6.1.1 pipe fittings
Fittings shall comply with all parts of this standard. After fitting to the hose, the smallest diameter of the tube or hose is not less than the joint Table 1
66% of the minimum inner diameter of the hose shown in FIG. All hose assemblies before any other test of this standard should be performed by this requirement.
6.1.2 Verify pressure
In the hose assembly charged air or nitrogen pressure of 2MPa ± 0.1MPa, and immersed in water should leak 30s.
6.1.3 The minimum burst pressure
Minimum burst pressure test according to GB/T 5563 for, when the hose or hose assembly is subjected to pressure 6MPa, there should be no blasting, vent
The drain pipe joint or separation.
6.1.4 assembly Tensile strength
Take a 450mm long hose assemblies (including joint) were tested for the rate of longitudinal stretching 25mm/min ± 2.5mm/min, and
Test until separation of the joint hose or hose damage. The nominal size of 6mm and less occurrence of failure load specifications of not less than 1100N,
Nominal size of 6mm or more is not less than 1450N.
6.1.5 change in length
Length variation test shall GB/T 5563 (elongation and contraction) of the initial pressure measurements are made at 0.1MPa. Hose or hose
Change in length of the assembly should be measured at 1.5MPa, and the variation range is between + 5% to 7%.
6.1.6 adhesive properties
Adhesion tests carried out on a sample shall only initial unaged.
6.1.6.1 adhesion performance fiber reinforced hose
Adhesion test shall GB/T 14905 method, hose, between the layers of the adhesion strength between the outer layer and the reinforcing layer is not less than
1.4kN/m.
6.1.6.2 wire reinforced hose adhesion performance
AⅠ type and requirements and methods for testing the performance AⅡ-sensitive adhesive layer with a wire reinforced hose outer cladding with 6.1.6.1. Take some do not
Less than 380mm long hose, according to the following requirements Adhesion Test inner liner.
Table 3 provides the specifications of the ball placed in the lumen of the hose. End of the hose is connected to a vacuum source, and the other end plugged. Basically in the hose
The straight state, 17kPa absolute vacuum is applied, maintaining 5min. After 5min remains under vacuum, the hose along two different ways
Respectively bent 180 ° to the table 2 in the minimum bend radius. The hose is bent back to basics straight state, still under vacuum, steel
Ball rolling from one end to the other end. The ball can be freely rolled from one end to the other end of said inner liner layer and the reinforcing layer was separated, and determines
Ineligible.
Table 3 Test improve the adhesion properties of the layer wire ball size in millimeters
Nominal size 568,111,316
Ball Specifications 3.5 4.5 6.0 7.5 9.5 12.0
6.2 Identification of performance
For the initial identification under this standard, all performance acceptance, and bending tests to identify performance requirements should be satisfied. Minimum sampling and provisions
The test procedure continues in accordance with Table 4.
Table 4 Minimum sampling and subsequent test procedures
Test Test Sample No. connection
1 6.1.1a 6.2.1.1, and 6.1.2.
2 6.1.1a 6.2.1.2, and 6.1.2.
3 6.2.2.1 -
4 6.1.1a 6.2.2.2, and 6.1.4
5 6.2.2.3 -
6 6.1.1a 6.2.2.4, and 6.1.3
7 6.1.1a 6.1.5, and 6.1.2 and 6.1.3
8 6.1.6 -
9 6.1.1a Chapter 7
mounting a pipe joint or before the start of the test to aging.
6.2.1 Temperature Performance
6.2.1.1 high temperature performance
The hose portion of the hose or hose assembly is bent on the model, and the aging tank at 100 ℃ ± 2 ℃, after 72h ± 2h after aging
When straight, not its internal and external cracks, charring and fragmentation should appear. Radius of the test model should be consistent with the provisions of Table 2. An outer braided fiber cladding soft
The outer surface of the tube is not feasible due to the visual inspection, inspection can be free from cracks item.
After completion of the test, the hose assemblies shall be tested in accordance with the verification 6.1.2 pressure.
6.2.1.2 low temperature performance
The hose and having radii as shown in Table 2 Model placed in an air circulating inside the rear through 70h ± 2h at -40 ℃ ± 2 ℃, this temperature
Of the hose is bent 180 ° on the model, not the inner and outer hose cracks should appear. in the whole process. Hoses and model should be based on non-metallic table
Surface support. 5s to be bent into a completed 3s. The outer surface of the fiber cladding outer braided hose is not feasible due to the visual inspection, the subject may be free from
Check cracking project.
6.2.2 environmental resistance
6.2.2.1 Oil
According to GB/T 1690-2006 experiment, samples were prepared from the inner liner and the outer cover ASTMIRM903 at 100 ℃ ± 2 ℃ of
Oil immersed 70h ± 2h, taken out from, the measurement volume expansion should not exceed 100%.
6.2.2.2 Water
The hose or hose assembly is bent and placed on the model listed in Table 2 of the minimum bend radius of distilled water at room temperature regulator 168h ± 2h.
To the end portion is completely sealed during impregnation.
After the test, the hose assemblies for assembly 6.1.4 tensile strength test.
6.2.2.3 Ozone
The hose assembly on the model table listed the minimum bend radius of bend 2, and placed in an ozone test chamber, ± 2 deg.] C at ambient temperature for 40 ℃
Under standard atmospheric conditions through 70h ± 2h, the gas tank is composed of air and ozone, the ozone partial pressure of 100 mPa (100 per million parts
100 parts of ozone air). 7 times was observed with a magnifying glass, the hose should not have cracks. The test only applies to elastomeric outer hose coating.
6.2.2.4 salt spray test
According to GB/T 10125 test. The hose assemblies to the vertical direction angle of 15 ° ~ 30 ° so as to support or suspend the salt spray exposure
In 24h ± 1h. After this exposure, in addition to the joint wrinkles and identification imprint the deformed part red rust can not accept the outer metal corrosion. White
Color corrosion products can be accepted.
After completion of the test, the hose assemblies 6.1.3 should burst strength test.
7 Flex test
7.1 Preparation of the sample
7.1.1 Prior to cutting the hose, the longitudinal direction of the hose (the hose with the natural bending line due to the coil formed by) a draw (color significantly different
The hose outer cover layer) line, see Figure 1.
FIG hose reticle 1
7.1.2 Sample hose assemblies hose cut to prepare a free length of the hose shown in Figure 2 and Table 5. The free length of the hose is finished soft
Hose pipe length between the exposed pipe joint assembly.
7.1.3 linker manufacturer's instructions should be fitted on the hose.
7.2 preconditioned
7.2.1 Salt spray regulation
Each of the sample assembly is first adjusted as follows, and then press 7.2.2 adjusted.
The end of the hose assembly of the sample plug, according to GB/T 10125 salt spray test method, exposed to salt spray 24h ± 1h.
After completion of the salt spray according to the adjusted start before high temperature aging test 7.2.2, the time interval should not exceed 168h.
7.2.2 High-temperature aging
Each specimen hose assembly is placed flat, aged 70h ± 2h at 100 ± 2 ℃ deg.] C in air. During the entire adjustment,
Each hose should be exposed to the lumen of the sample in air aging tank.
At least 2h with the hose assembly cooled to room temperature, but before high temperature aging after completing the 7.3 and 7.4 according to the flexural test start,
Time interval should not exceed 168h.
7.3 in the test sample is mounted in the apparatus
After preconditioning the sample, in 5 Figure 2 and Table predetermined manner mounted in the test apparatus. Installation procedures are as follows.
Flex test apparatus 2 of FIG.
TABLE 5 millimeters deflection test device
Hose free
Length ± 2
Nominal size
size
Position 1 Position 2
ABCRABCR
± 3 ± 3 ± 3 Reference ± 3 ± 3 ± 3 Reference
255 5,6 7,570,953,475,709,530
280 8,10,11 75 9,011,543,759,011,533
355 12,13SP, 13,15,16 75 100 125 56 75 100 125 46
7.3.1 flex tester movable manifold center of its travel, so that mark line is located in the top center of the connector "B" connected to the movable manifold
Tube (see FIG. 2).
7.3.2 mounted connector "B" to the rear of the movable manifolds, then the joint "A" is connected to a stationary manifold, not imposing any twist connection, it should be
Allowing its natural bent.
7.4 Test Procedure
7.4.1 Overview
Deflection from the center of the sample is obtained by moving the position of the stroke linker "B" from each side of the center to 75mm (dimension A in FIG. 2), i.e., the position
"1" and the position "2" are alternately performed. At the same time, pressure is applied to the circulating air, the opening 60s, OFF 60s.
7.4.2 flex/pressure cycling test parameters
7.4.2.1 The total deflection stroke
150mm ± 1.5mm.
7.4.2.2 deflection stroke frequency
1.7Hz ± 0.1Hz.
7.4.2.3 Ambient temperature
26 ℃ ± 6 ℃.
7.4.2.4 inner pressure of the sample
1MPa ± 0.1MPa. Air pressure should alternate, all "open" 60s ± 5s, all "OFF" 60s ± 5s.
7.5 bending test termination
Due to damage of the sample can lead to loss of air pressure, whereby the measurement can be the point of failure (the number of cycles Flexing). Air pressure is provided by cross
For all "open" 60s ± 5s and full "off" 60s ± 5s applied. Through a 1.6mm + 0.05 0 mm diameter orifice again in 2min
When pressurized to 1MPa ± 0.1MPa, the pressure loss can be referred to as system damage. The system does not before completing one million cycles Flexing
It should be destroyed.
8 logo
8.1 the hose surface should not easily fall off significantly following identification.
a) a hose manufacturer identification ××××;
b) the word "air brake" identifies the particular use hose;
c) standard number typed and hose;
d) Hose nominal inside diameter, expressed in mm;
e) date of manufacture (month and year).
Example. MAN Air Brake GB 7128 A 10
07-10-8
October 2007 8
Nominal inside diameter
A
Standard
Hoses name
plant name or trademark
8.2 assembly should be permanently etched, embossed or imprinted following identification.
a) assembly manufacturing date (year, month, date), e.g., 07-10-8 indicates October 8, 2007;
b) When If required, the name and additional information assembler.
Appendix A
(Informative)
This standard clauses number and SAEJ1402.2005 clauses control number
Table A. 1 shows the numbering of this standard reg SAEJ1402.2005 reg number control list.
Table A. A number of standard clauses SAEJ1402.2005 clauses control number
This standard clauses corresponding number SAEJ1402.2005 clauses No.
6.1 7.1
6.1.1 7.1.1
6.1.2 7.1.2
6.1.3 7.1.3
6.1.4 7.1.4
6.1.5 7.1.5
6.1.6 7.1.6
6.1.6.1 7.1.6.1
6.1.6.2 7.1.6.2
6.2 7.2
6.2.1 7.2.1
6.2.1.1 7.2.1.1
6.2.1.2 7.2.1.2
6.2.2 7.2.2
6.2.2.1 7.2.2.1
6.2.2.2 7.2.2.2
6.2.2.3 7.2.2.3
6.2.2.4 7.2.2.4
7.1 8.1
7.2 8.2
Suspension under section 7.2.1 8.2
7.2.1 8.2.1
7.2.2 8.2.2
7.3 8.3
7.3.1 8.3.1
7.3.2 8.3.2
7.4 8.4
Suspended under section 7.4.1 8.4
Table A. 1 (cont.)
This standard clauses corresponding number SAEJ1402.2005 clauses No.
7.4.2 8.4.1
7.4.2.1 8.4.1.1
7.4.2.2 8.4.1.2
7.4.2.3 8.4.1.3
7.4.2.4 8.4.1.4
7.5 8.5
8.1 6.1
8.2 6.3
Appendix A -
references
[1] SAEJ517.2005 HydraulicHose.
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