GB/T 13881-2019Road vehicles - Pneumatic braking connections between towing vehicles and trailers (English PDF)

3.1 ~ 3.6 in Version 1992);

---The requirements for the numerical value of A and B in connector

interchangeability dimension table are modified (see Table 1 in 3.5; 2.6 in

Version 1992);

---The requirements for connector colors are modified; the requirements for jumper

hose colors are deleted (see 6.3; 3.7 in Version 1992);

The formulation of this Standard adopts the re-drafting law and takes ISO 1728:2006

Road Vehicles - Pneumatic Braking Connections between Motor Vehicles and Towed

Vehicles - Interchangeability as a reference. The degree of consistency with ISO

1728:2006 is non-equivalent.

This Standard was proposed by Ministry of Industry and Information Technology of

People's Republic of China.

This Standard shall be under the jurisdiction of National Technical Committee 114 on

Road Vehicles of Standardization Administration of China (SAC/TC 114).

The drafting organizations of this Standard: Research Institute of Highway Ministry of

Transport; Beijing Foton Daimler Automotive Co., Ltd.; RUILI Group RUIAN

Automotive Parts Co., Ltd.; WABCO Vehicle Control Systems Co., Ltd.; Beijing HUATE

Auto Parts Co., Ltd.

3.1 Pneumatic braking connector is connected by fixed joint and movable joint (see

Figure 1).

After air-tightness test, connector's pressure drop shall not be more than 10 kPa.

4.3 Corrosion Resistance

After corrosion resistance test, respectively test the torque of connection and

disconnection, and air-tightness in accordance with 5.1 and 5.2. A normally functioning

connector shall satisfy the requirements of the torque of connection and disconnection

in 4.1 and the requirements of air-tightness in 4.2.

4.4 Durability

After durability test, in accordance with 5.1 and 5.2, respectively test the torque of

connection and disconnection, and air-tightness. A normally functioning connector

shall satisfy the requirements of the torque of connection and disconnection in 4.1 and

the requirements of air-tightness in 4.2.

4.5 Pull-off Resistance

When connector is pulled off, the tensile force shall be 220 N ~ 1,334 N.

After pull-off test, in accordance with 5.1 and 5.2, respectively test the torque of

connection and disconnection, and air-tightness. A normally functioning connector

shall satisfy the requirements of the torque of connection and disconnection in 4.1 and

the requirements of air-tightness in 4.2.

4.6 Dropping Resistance

After drop test, in accordance with 5.1 and 5.2, respectively test the torque of

connection and disconnection, and air-tightness. A normally functioning connector

shall satisfy the requirements of the torque of connection and disconnection in 4.1 and

the requirements of air-tightness in 4.2.

4.7 High Temperature

After high temperature test, under the stipulated temperature conditions, in accordance

with 5.1 and 5.2, respectively test the torque of connection and disconnection, and air-

tightness. A normally functioning connector shall satisfy the requirements of the torque

of connection and disconnection in 4.1 and the requirements of air-tightness in 4.2.

4.8 Low Temperature

After low temperature test, under the stipulated temperature conditions, in accordance

with 5.1 and 5.2, respectively test the torque of connection and disconnection, and air-

tightness. A normally functioning and disconnected connector shall satisfy the

requirements of the torque of connection and disconnection in 4.1 and the

requirements of air-tightness in 4.2; a normally functioning and connected connector

shall satisfy the requirements of air-tightness in 4.2.

2---movable joint;

M---pressure meter;

C---1 L air cylinder;

A---control valve;

FR---pressure regulating valve.

Figure 4 -- Principle of Air-tightness Test of Pneumatic Braking Connector

5.3 Corrosion Resistance Test

In accordance with GB/T 10125, conduct 240 h corrosion resistance test on two pairs

of new connectors (one pair is correctly connected, with the threaded port blocked; the

other pair is disconnected). After the test, in accordance with 5.1 and 5.2, respectively

test the torque of connection and disconnection, and air-tightness.

5.4 Durability Test

In accordance with the requirements, conduct the operation of connection and

disconnection on one pair of new connectors. At the rate of 15 ~ 25 cycles in each

minute, complete 2,500 cycles. A complete cyclic process shall include one connection

and one disconnection. After the test, in accordance with 5.1 and 5.2, respectively test

the torque of connection and disconnection, and air-tightness.

5.5 Pull-off Resistance Test

In accordance with the requirements, connect one pair of new connectors. Meanwhile,

connect the air supply pipeline and raise pressure to 850 kPa +/- 30 kPa. Then, apply

tensile force onto the connector along the direction of the center line of the braking

pipeline. The tensile force shall gradually increase from 0, till the connector is

disconnected. After the test, in accordance with 5.1 and 5.2, respectively test the

torque of connection and disconnection, and air-tightness.

5.6 Dropping Resistance Test

Respectively from the height of at least 1.8 m, randomly drop the two joints of the

connector onto concrete surface, for at least once. After the test, in accordance with

5.1 and 5.2, respectively test the torque of connection and disconnection, and air-

tightness.

5.7 High Temperature Test

Expose two pairs of new connectors (one pair is correctly connected; the other pair is

disconnected) at the temperature of 80 °C +/- 3 °C for at least 24 h. Then, at this

temperature, in accordance with 5.1 and 5.2, respectively test the torque of connection

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