JT/T 1178.2-2019 English PDF (JT/T1178.2-2019)

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JT/T 1178.2-2019: Safety specification for commercial vehicle for cargos transportation -- Part 2: Towing vehicle and trailer
JT/T 1178.2-2019
JT
TRANSPORT INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.080.10
T 43
Filing No.:
Safety specification for commercial vehicle for cargos
transportation - Part 2: Towing vehicle and trailer
ISSUED ON: MARCH 15, 2019
IMPLEMENTED ON: JUNE 01, 2019
Issued by: Ministry of Transport of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 8 
4 Complete vehicle ... 10 
5 Braking system ... 13 
6 Safety protection ... 15 
7 Mechanical connection ... 16 
8 Pneumatic and electric connection ... 18 
9 Load layout identification and securing points... 19 
10 Alarms and reminders ... 19 
11 Transition period for standard implementation ... 20 
Appendix A (Informative) Example of nameplate of vehicle interchangeability
information ... 21 
Appendix B (Normative) Technical requirements and test methods for tire
pressure monitoring system ... 23 
Appendix C (Normative) Strength test method for the mounting bracket of the
draw bar connector AND the rigid connecting rod of the draw bar's hanger of
the center-axle trailer combination ... 29 
Appendix D (Informative) Drawing and example of load layout identification
curve ... 32 
References ... 40 
Safety specification for commercial vehicle for cargos
transportation - Part 2: Towing vehicle and trailer
1 Scope
This Part of JT/T 1178 specifies the safety technical requirements and test
methods, for the complete vehicle, braking system, safety protection,
mechanical connection, pneumatic and electrical connection, load layout
identification and securing points, alarms and reminders, of towing vehicles and
trailers.
This Part is applicable to category N2 and category N3 towing vehicles, category
O3 and category O4 trailers, as well as their combinations.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) is applicable to this standard.
GB 1589 Limits of dimensions, axle load and masses for motor vehicles,
trailers and combination vehicles
GB/T 3730.1 Motor vehicles and trailers - Types - Terms and definitions
GB/T 3730.2 Road vehicle - Masses - Vocabulary and codes
GB 4094 Motor vehicles - Symbols for controls, indicators and tell-tales
GB/T 4606 Road vehicles - 50 semi-trailer fifth wheel coupling pin - Basic
and mounting/interchangeability dimensions
GB/T 4781 Commercial road vehicles - 50 mm draw bar eye -
Interchangeability
GB 4785 Prescription for installation of the external lighting and light-
signaling devices for motor vehicles and their trailers
GB/T 5053.1-2006 Road vehicles - Connectors for the electrical connection
of towing and towed vehicles - 7-pole connector type 24 N (normal) for
vehicles with 24 V nominal supply voltage
test method, which is specified in GB/T 14172. The rollover stability angle shall
meet the following requirements:
a) Under no-load and static conditions, the rollover stability angles, which are
inclined to the left and right, shall be greater than or equal to 35°;
b) Under full load and static conditions, the rollover stability angles, which
are inclined to the left and right, shall be greater than or equal to 23°.
Simulation calculations can also be carried out, with reference to Chapter
6 of GB 28373-2012, under the loading conditions specified by the
enterprise.
4.3 When the towing vehicle is in the vehicle combination state (meeting the
enterprise's product design AND not exceeding the maximum outline size
specified in GB 1589, except for tank vehicles), it shall be subject to the steady-
state rotation test, under full load, in accordance with the provisions of Chapter
10 of GB/T 6323-2014. The understeer of the towing vehicle shall be greater
than 0° /(m/s2) AND less than or equal to 1°(m/s2).
4.4 Towing trucks and vehicle combinations (meeting the enterprise's product
design AND not exceeding the maximum external dimensions specified in GB
1589, except for tank vehicles), shall be subject to the snaking test, under full
load, in accordance with the provisions of Chapter 5 of GB/T 6323-2014. For
the peak average yaw velocity of towing trucks (single-vehicle status) and
towing vehicles (vehicle combination state), it shall be less than the lower limit
of QC/T 480's corresponding stake spacing and reference vehicle speed.
4.5 Towing trucks and vehicle combinations (meeting the enterprise’s product
design AND not exceeding the maximum external dimensions specified in GB
1589, except for tank vehicles) shall be subjected to the rollover stability test,
under full load, in accordance with the test method specified in JT/T 884. When
the centripetal acceleration, at the center of mass of the towing truck (single
vehicle state) and the towing vehicle (vehicle combination state) reaches 0.4 g,
neither the towing vehicle nor the trailer will rollover or slip.
4.6 When towing vehicles and trailers travel 500 m, in a straight line at a speed
of 30 km/h, on a flat and dry pavement, under no-load conditions (meeting the
enterprise’s product design AND not exceeding the maximum outline size
specified in GB 1589), in the vehicle combination state, THEN, for the maximum
swing amplitude of the center of the rear axle of the trailer, as relative to the
center of the front axle of the towing vehicle, it shall be less than or equal to 100
mm for the articulated vehicle and center-axle trailer combination, OR less than
or equal to 150 mm for the draw bar trailer combination.
4.7 For the towing vehicles and trailers (meeting the design of the enterprise's
product AND not exceeding the maximum external dimensions specified in GB
5 Braking system
5.1 The pneumatic braking system of the towing vehicle and the trailer shall be
equipped with a device, which has the function of keeping the compressed air
dry AND separating oil and water.
5.2 All service brakes of the towing vehicle and the trailer shall have the function
of automatically adjusting the brake gap.
5.3 The air cylinders and brake air chambers of the brake system, in the towing
vehicles and trailers, shall be equipped with pressure test connectors for air
brake devices. The performance of the pressure test connector shall meet the
requirements of GB/T 5922.
5.4 The towing vehicle shall be equipped with a category-1 anti-lock braking
system, that complies with the provisions of GB/T 13594. The trailer shall be
equipped with a category-A anti-lock brake system, that complies with the
provisions of GB/T 13594. The towing vehicle shall be equipped with a signal
device, which alarms when the anti-lock brake system fails (including the failure
of the trailer's anti-lock brake system). The electromagnetic compatibility of the
anti-lock brake devices, in towing vehicles and trailers, shall comply with the
level 3 requirements in GB/T 18655 as well as the requirements in GB/T 17619.
5.5 Towing vehicles and trailers, which have a maximum speed greater than or
equal to 90 km/h, shall be equipped with electronic braking systems (EBS). The
performance of EBS shall meet the requirements of GB 12676 and GB/T 13594.
5.6 Towing vehicles, which have a maximum speed greater than or equal to 90
km/h, shall be equipped with an automatic eme...