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GB 16897-2010 English PDF (GB16897-2010)

GB 16897-2010 English PDF (GB16897-2010)

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GB 16897-2010: Brake hose -- Structure, performance and test methods

This Standard specifies the structure, performance requirements, test methods and marking of brake hose, brake hose end fitting and brake hose assembly for automobiles (including motorcycles) and trailers.
GB 16897-2010
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 43.040.40
T 24
Replacing GB 16897-1997
Brake hose ?€?
Structure, performance and test methods
ISSUED ON. JANUARY 10, 2011
IMPLEMENTED ON. JULY 1, 2011
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration Committee.
3. No action is required - Full-copy of this standard will be automatically and immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 General requirements ... 6
5 Hydraulic brake hose assembly ... 7
6 Pneumatic brake hose assembly ... 15
7 Vacuum brake hose assembly ... 19
8 Marks ... 24
Foreword
Requirements for performance in Table 1, Table 6 and Table 9 in this
Standard as well as Clause 8 are mandatory; the rest are recommendatory. The consistency between this Standard and FMVSS 106-1993 Brake hoses.
This Standard replaces GB 16897-1997 Brake hose.
Compared with GB 16897-1997, the main modifications in this Standard are as follows.
- added English names for terms (see Clause 3 of this Edition);
- added the number of test samples (see Table 1, Table 6, Table 9 of this Edition);
- added the ?€?high temperature pulse resistance?€? test of hydraulic brake hose assembly (see Table 1 of this Edition);
- added the equation of ?€?rupture strength?€? of plastic hose (see Table 6 of this Edition);
- modified the marks used for vacuum brake hose (see Clause 8 of this
Edition);
- deleted the terms of ?€?permanently connected pipe fittings?€? and ?€?vacuum pipe connector?€? (see Sub-clauses 3.6, 3.8 of Edition 1997);
- deleted the ?€?air tightness?€? in ?€?cold resistance?€? of pneumatic brake hose assembly (see Sub-clause 6.2.8 of Edition 1997);
- modified the evaluation indicators for burst strength of hydraulic brake hose assembly with inside diameter of ??3.2 mm (see Table 1 of this
Edition);
- modified the vacuum brake hose size and test requirements for some
items (see Clause 7).
This Standard was proposed by National Development and Reform
Commission, People's Republic of China.
This Standard shall be under the jurisdiction of National Technical Committee on Automobiles of Standardization Administration of China (SAC/TC 114). Main drafting organization of this Standard. China First Automobile Group Corporation Technology Center.
Brake hose ?€?
Structure, performance and test methods
1 Scope
This Standard specifies the structure, performance requirements, test
methods and marking of brake hose, brake hose end fitting and brake hose assembly for automobiles (including motorcycles) and trailers.
This Standard is applicable to hydraulic, pneumatic, vacuum brake hose, brake hose end fitting and brake hose assembly for automobiles (including motorcycles) and trailers.
2 Normative references
The following standards contain the provisions which, through reference in this Standard, constitute the provisions of this Standard. For dated references, subsequent amendments (excluding corrections) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 1690-2006, Rubber vulcanized or thermoplastic - Determination of
the effect of liquids
GB/T 7129-2001, Rubber or plastics hoses - Determination of volumetric
expansion
GB/T 10125-1997, Corrosion tests in artificial atmospheres - Salt spray tests
GB 12981, Motor vehicle brake fluids
GB/T 14905-1994, Rubber and plastics hose - Determination of adhesion
between components
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. 3.1 brake hose
a flexible hydraulic, pneumatic, or vacuum conduit for the transmission or storage of automotive brake force, in addition to a pipe joint in the braking system
3.2 brake hose end fitting
in addition to the clamp, the connection to the end of the brake hose
3.3 brake hose assembly
brake hose mounted with brake hose connector; the brake hose can be with or without armor
3.4 armor
a protective device for improving the anti-scratch or impact resistance of a brake hose outside the brake hose
3.5 free length
the straight length of the exposed brake hose between the end fittings when the brake hose assembly is in the vertical position
3.6 rupture
a failure resulting in brake hose disengaged from pipe fitting or leakage 3.7 nominal inside diameter
a specification used to describe the size of brake hose; for rubber hose, use an inside diameter in ?€????€? and millimeters to represent, for example, ?€???3.2 mm hose?€? refers to the plastic hose of which the nominal inside diameter is 3.2 mm; for plastic hose, use an outside diameter in ?€????€? and millimeters to represent, for example, ?€???8 mm hose?€? refers to the plastic hose of which the nominal outside diameter is 8 mm.
4 General requirements
4.1 The brake hose assembly used for test shall be manufactured at least 24 hours prior to use and not used. Before the test, the brake hose assembly shall be kept at a temperature of 15??C ~ 32??C for at least 4h.
4.2 Before the brake hose assembly used for flex fatigue test and cold
resistance test is installed on the test equipment, all accessories shall be removed, such as steel armor, rubber armor, etc.
3 - copper tube;
4 - fitting;
5 - brake hose for test
6 - cock.
Figure 2 -- Compatibility test device
5.3.4.2 Test procedures
The test procedures are as follows.
a) place the brake hose assembly at a temperature of 90??C ?? 1??C for 70h ?? 2h;
b) exhaust the brake fluid from the brake hose assembly; remove the brake hose assembly and cool at room temperature for 30min ?? 5min;
c) check the bore-through-volume after necking according to 5.3.1;
d) carry out the rupture strength test of brake hose assembly according to 5.3.3 within 3h.
5.3.5 Flexion fatigue
5.3.5.1 Test equipment
The test equipment is mainly composed of rotating part and fixed part. The equipment diagram shown in Figure 3. The rotating part consists of a
movable horizontal connecting rod and a turntable. Both ends of the movable horizontal connecting rod are mounted vertically on the turntable by bearings. The center of the turntable is 101.6 mm from the center of the bearing. The fixed part is an adjustable non-moving horizontal connecting rod. The
non-moving horizontal connecting rod is parallel to the movable horizontal connecting rod in the same horizontal plane as the turntable center. Both horizontal connecting rods are equipped with several connectors that can be fitted with a parallel brake hose assembly. When the turntable is rotated at a rate of 800 r/min ?? 10 r/min, the end of the brake hose fixed to the movable horizontal connecting rod shall also rotate at this rate to form a circular trajectory of 203.20 mm ?? 0.25 mm while the other end of the hose is fixed. The connector on the movable horizontal connecting rod is closed. The
fittings on the non-moving horizontal connecting rod shall be connected to the hydraulic source. The hydraulic fluid volume and piping settings of the test equipment are not allowed to affect the test results. When the brake hose is damaged and the pressure drops to the set value, the test equipment shall be able to automatically shut down while recording the operating time and the system pressure in the line.
the brake hose.
5.3.9.2 Test procedures
The test procedures are as follows.
a) place the mandrel that is wound with the brake hose assembly for more than 24 hours at room temperature; and then place it in an ozone test
aging box with the ozone concentration of (50??5) ??10-8, with the box
temperature of 40??C ?? 2??C; and maintain for 70h ?? 2h;
b) check whether the outer surface of the brake hose is chapped or
cracked under a 7x magnifying glass; the strap part or the part near the strap part shall be negligible.
5.3.10 High temperature pulse resistance
5.3.10.1 Test device
The test devices are as follows.
a) the pressure recirculation device shall be capable of applying 11 MPa of pressure and automatically control the pressure application and
pressure relief cycle;
b) a heating system with a suitable thermostatic control device and a
thermally insulated air oven capable of maintaining a temperature of
143??C ?? 3??C.
5.3.10.2 Test procedures
The test procedures are as follows.
a) connect the brake hose assembly to a pressure cycler capable of
producing 0 MPa ~ 11 MPa;
b) fill the pressure cycle device and brake hose assembly with HZY3 brake fluid specified in GB 12981, and exhaust air;
c) place the brake hose assembly in an oven and make the oven
temperature reach a temperature of 143??C ?? 30??C;
d...

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