GB/T 37245-2018 English PDF (GB/T37245-2018)

GB/T 37245-2018: General Technical Requirements for Center-axle Trailer
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GB/T 37245-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.080.01
T 70
General Technical Requirements
for Center-axle Trailer
ISSUED ON. DECEMBER 28, 2018
IMPLEMENTED ON. JULY 1, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 6 
4 Technical Requirements ... 7 
5 Test Methods ... 13 
6 Inspection Rules ... 14 
7 Marking, Accessory Documents, Transportation, Storage and Exit-factory
Requirement ... 15 
General Technical Requirements
for Center-axle Trailer
1 Scope
This Standard specifies the terms, definitions, technical requirements, test methods,
inspection rules, marking, accessory documents, transportation, storage and exit-
factory requirement of center-axle trailer.
This Standard is applicable to center-axle trailers that are operated on roads. Other
center-axle trailers can take this as a reference in implementation.
2 Normative References
The following documents are indispensable to the application of this Standard. In terms
of references with a specified date, only versions with a specified date are applicable
to this Standard. The latest version (including all the modifications) of references
without a specified date is applicable to this Standard.
GB/T 1589 Limits of Dimensions, Axle Load and Masses for Motor Vehicles,
Trailers and Combination Vehicles
GB/T 3730.1-2001 Motor Vehicles and Trailers - Types - Terms and Definitions
GB/T 3730.2 Road Vehicle - Masses - Vocabulary and Codes
GB/T 3730.3 Motor Vehicles and Towed Vehicles - Dimensions of Vehicles - Terms
and Definitions
GB/T 4781 Commercial Road Vehicles - 50 mm Drawbar 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 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
GB 7258 Technical Specifications for Safety of Power-driven Vehicles Operating
on Roads
GB 11567 Motor Vehicles and Trailers - Lateral and Rear Underrun Protection
between Towing Vehicles and Trailers
GB/T 35782 Specification for Swap Trailer Transport of Road Vehicles
GB/T 36121 Technical Requirements for Caravans
JB/T 5943 Engineering Machinery - General Technical Specifications for
Weldments
JT/T 389 Specification for Van Trailers
QC/T 484 Automobile Paint Coating
ISO 11407 Commercial Road Vehicles - Mechanical Coupling between Towing
Vehicles with Coupling Mounted Forward and Below, and Center-axle Trailers -
Interchangeability
ISO 12357 Road Vehicles - Drawbar Couplings and Eyes for Rigid Drawbars -
Strength Tests
3 Terms and Definitions
The following terms and definitions, and what is defined in GB 1589, GB/T 3730.1 ~
3730.3 and GB/T 17350 are applicable to this document.
In order to make it convenient for usage, some terms and definitions in GB/T 3730.1
are repeatedly listed out below.
3.1 Center-axle Trailer
Center-axle trailer refers to a kind of trailer, whose traction device cannot vertically
move (relative to trailer) and whose axle is close to the center of gravity (when evenly
loaded). In terms of this kind of trailer, only a little vertical static load is acting on the
tractor, and not more than 10% of the maximum total mass of trailer or 10,000 N of
load (the smaller one shall prevail). One axle or multiple axles can be driven by the
tractor.
[GB/T 3730.1-2001, definition 2.2.3]
3.2 Center-axle Trailer Combination
Center-axle trailer combination refers to the combination of truck and center-axle trailer.
3.3 Van Center-axle Trailer
Van center-axle trailer refers to center-axle trailer, which has an independent closed
compartment structure, including fixed compartment and interchangeable
compartment, and can endure the stipulated load.
4.1.8 After van center-axle trailer is connected with truck, when center-axle trailer’s
supporting device is withdrawn, the minimum ground clearance shall be not less than
320 mm.
4.1.9 The dimension parameters of connecting device of center-axle trailer (excluding
caravan) and position parameter of adapted truck connector shall be marked in a
conspicuous position of the front-end beam of the frame and clarified in technical
documents.
4.1.10 Center-axle trailer for vehicle transportation shall comply with relevant
requirements of finished trailers in GB/T 26774; center-axle caravan shall comply with
relevant requirements of finished trailers in GB/T 36121.
4.1.11 Refrigeration and insulation performance of refrigerating van center-axle trailer
shall comply with the stipulation in GB 29753.
4.2 Frame
4.2.1 When the total length of frame is not more than 8,000 mm, the dimensional
deviation of its length shall be ± 5 mm. Every 1,000 mm of increase in length (when
the increase is less than 1,000 mm, count by 1,000 mm), the dimensional deviation of
length is allowed to increase 1 mm. The dimensional deviation of the measured width
at random measurement point shall be ± 4 mm.
4.2.2 The longitudinal straightness tolerance of longitudinal web shall be 2 mm in
random 1,000 mm of length; it shall be 1‰ length in the full length.
4.2.3 At random cross section of the longitudinal and horizontal beam, the
perpendicularity tolerance of the upper and lower air foil against the web shall be not
more than 1% of the width of the flange.
4.2.4 The symmetric upper plane of the left and right longitudinal beam of the frame
assembly shall be within the same plane. The flatness tolerance shall be 1‰ of the
length of the plane being measured.
4.2.5 The perpendicularity tolerance of the primary beam of the frame against the
longitudinal web shall be not more than 3‰ of the length of the horizontal beam.
4.2.6 When the length of the frame is not more than 4,000 mm, the diagonal difference
of the frame shall be not more than 6 mm. Every 1,000 mm of increase in length (when
the increase is less than 1,000 mm, count by 1,000 mm), the diagonal difference of the
frame is allowed to increase 1 mm.
4.2.7 Frames that transport interchangeable compartment shall be equipped with
locking mechanism that complies with relevant requirements in GB/T 17382.
4.3 Compartment
4.4.8 Center-axle trailer shall be equipped with gas-electric connection device that
complies with the requirement in GB/T 5053.1, GB/T 13881 and GB/T 20716.1.
4.4.9 The installation and pasting of reflective logo on the body of center-axle trailer
shall comply with the stipulation in GB 23254 and GB 7258. The installation of
identification plate on the tail of trailer shall comply with the stipulation in GB 25990
and GB 7258.
4.4.10 The side and rear-end guard device of center-axle trailer shall comply with the
stipulation in GB 11567.
4.4.11 The setting of number plate (frame) shall comply with the stipulation in GB
15741 and GB 7258.
4.4.12 In a conspicuous position of the rear of center-axle trailer, 1 ~ 2 rectangular
marking plates with the words “long vehicle” shall be installed. The length of the
marking plates shall be 500 mm ± 10 mm; width shall be ; background
color shall be yellow; the words shall be red. The colorimetric performance and
photometric performance of the marking plates shall comply with the stipulation in GB
25990. The typeface of the words shall be normalized Chinese characters, which shall
be put in an order from the left to the right, or from top to bottom. Character height shall
be 180 mm ± 5 mm; character width and character height shall be equivalent.
4.4.13 Center-axle trailer shall be equipped with a spare tire, which shall be firmly
fixated; conveniently assembled and disassembled.
4.4.14 Center-axle trailer shall be equipped with at least 2 parking wedges (for example,
triangular sole timber).
4.5 Mechanical Connection Requirements
4.5.1 The longitudinal distance A (Figure 1) from the projection point of van center-axle
trailer’s traction loop center on a horizontal plane to the projection of truck’s rearmost
end on a horizontal plane shall comply with the stipulation in Table 1.
4.5.2 The up and down swinging angle  (Figure 1) of center-axle trailer’s tow bar
around the traction connector shall be not less than 6°. In addition, the minimum gap
between the upper plane of the tow bar and the lower end of truck shall be not less
than 125 mm (Figure 1).
4.5.3 Under the fully-loaded state, the vertical distance from center-axle trailer’s
traction loop center to the vehicle’s supporting horizontal plane shall be 380 ± 25 mm
(Figure 1).
and incompletion phenomena are not allowed on rivet head. The gap between rivet
head and metal fitting surface shall be not more than 0.1 mm.
4.6.3 Paint coating shall comply with the stipulation in QC/T 484 and product design.
4.6.4 All the adapting pieces and fasteners shall receive surface anti-rust treatment.
Various joint parts shall be firm and reliable; satisfy the stipulated requirement of torque.
4.6.5 Oil cup and oil nozzle shall be fully assembled; filled with lubricating grease. Paint
lubricating grease to other friction surfaces in accordance with the stipulation.
4.6.6 All the pipelines and circuits shall be reasonably distributed, firmly fixated and
reliably clamped. During the vehicle operation process, friction interference
phenomena are not allowed. Oil, gas and water pipelines shall not manifest any
phenomena of leakage.
4.7 Performance Requirements
4.7.1 The braking performance of center-axle trailer and center-axle trailer combination
shall comply with the stipulation in GB 7258 and GB 12676.
4.7.2 The lateral acceleration amplification factor of van center-axle trailer combination
(test speed. 80 km/h) shall be not more than 2.0.
4.7.3 Under the empty-load and static state, center-axle trailer combination’s left and
right tilting stability angle shall be not less than 35°.
4.7.4 When center-axle trailer combination is in straight driving on a flat and dry ground
at the speed of 30 km/h, the maximum offset of center-axle trailer’s rear axle track
centerline relative to tractor’s front axle track centerline shall be not more than 110 mm.
4.7.5 The trafficability and external pendulum of center-axle trailer combination shall
comply with the stipulation in GB 1589.
5 Test Methods
5.1 Determination of main quality parameters of center-axle trailer shall comply with
relevant stipulation in GB/T 13873.
5.2 Center-axle trailer, and its combination’s dimension and driving stability shall
comply with the stipulation in GB/T 26778.
5.3 Determination of trafficability and external pendulum of center-axle trailer
combination shall comply with the stipulation in GB 1589.
5.4 Lateral stability test of center-axle trailer combination shall comply with the test
method of single-lane exchange stipulated in GB/T 25979 and the test speed of 80
GB/T 37245-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.080.01
T 70
General Technical Requirements
for Center-axle Trailer
ISSUED ON. DECEMBER 28, 2018
IMPLEMENTED ON. JULY 1, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 6 
4 Technical Requirements ... 7 
5 Test Methods ... 13 
6 Inspection Rules ... 14 
7 Marking, Accessory Documents, Transportation, Storage and Exit-factory
Requirement ... 15 
General Technical Requirements
for Center-axle Trailer
1 Scope
This Standard specifies the terms, definitions, technical requirements, test methods,
inspection rules, marking, accessory documents, transportation, storage and exit-
factory requirement of center-axle trailer.
This Standard is applicable to center-axle trailers that are operated on roads. Other
center-axle trailers can take this as a reference in implementation.
2 Normative References
The following documents are indispensable to the application of this Standard. In terms
of references with a specified date, only versions with a specified date are applicable
to this Standard. The latest version (including all the modifications) of references
without a specified date is applicable to this Standard.
GB/T 1589 Limits of Dimensions, Axle Load and Masses for Motor Vehicles,
Trailers and Combination Vehicles
GB/T 3730.1-2001 Motor Vehicles and Trailers - Types - Terms and Definitions
GB/T 3730.2 Road Vehicle - Masses - Vocabulary and Codes
GB/T 3730.3 Motor Vehicles and Towed Vehicles - Dimensions of Vehicles - Terms
and Definitions
GB/T 4781 Commercial Road Vehicles - 50 mm Drawbar 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 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
GB 7258 Technical Specifications for Safety of Power-driven Vehicles Operating
on Roads
GB 11567 Motor Vehicles and Trailers - Lateral and Rear Underrun Protection
between Towing Vehicles and Trailers
GB/T 35782 Specification for Swap Trailer Transport of Road Vehicles
GB/T 36121 Technical Requirements for Caravans
JB/T 5943 Engineering Machinery - General Technical Specifications for
Weldments
JT/T 389 Specification for Van Trailers
QC/T 484 Automobile Paint Coating
ISO 11407 Commercial Road Vehicles - Mechanical Coupling between Towing
Vehicles with Coupling Mounted Forward and Below, and Center-axle Trailers -
Interchangeability
ISO 12357 Road Vehicles - Drawbar Couplings and Eyes for Rigid Drawbars -
Strength ...