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JT/T 475-2002 (JTT 475-2002)

Chinese Standard: 'JT/T 475-2002'
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Standard ID JT/T 475-2002 (JT/T475-2002)
Description (Translated English) Trailer axle
Sector / Industry Highway & Transportation Industry Standard (Recommended)
Classification of Chinese Standard T73
Classification of International Standard 43.080.10
Word Count Estimation 9,971
Date of Issue 2002-04-26
Date of Implementation 2002-07-01
Older Standard (superseded by this standard) JT/T 3139.1-1989; JT/T 3139.2-1989
Quoted Standard JB/T 5000.3; QC/T 239; QC/T 479; QC/T 484
Drafting Organization Ministry of Transportation Highway Research Institute
Administrative Organization Ministry of Transportation, Highway Research Institute
Summary This standard specifies the trailer axle (with wheel brake assembly and chamber bracket) of the type, the basic parameters, technical requirements, test methods and inspection rules. This standard applies to factory setting maximum total mass exceeding 8t used cargo trailer axle.

JT/T 475-2002
ICS 43.080.10
T 73
Registration No.. 10297-2002
Replacing JT/T 3139.1-1989 and JT/T 3139.2-1989
Trailer Axle
Issued by. Ministry of Communications of the People's Republic of China
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Types ... 4 
4 Basic Parameters of Trailer Axles ... 5 
5 Technical Requirements ... 6 
6 Bench Test ... 7 
7 Inspection Rules ... 10 
8 Others ... 11 
This Standard has been made by combining and revising JT/T 3139.1-1989 “Trailer
Axle Assembly – Basic Parameter Series” and JT/T 3139.2-1989 “Trailer Axle –
General Specifications”. Significant changes have been made on the technical content
of the original standards. this Standard deletes the torsional strength test for trailer axle,
improves the technical specifications of bending fatigue life, and adds the technical
requirements and test methods for wheel brake.
JT/T 3139.1-1989 and JT/T 3139.2-1989 shall be abolished from the implementation
date of this Standard.
This Standard was proposed by and shall be under the jurisdiction of the Highway
Department of the Ministry of Communications.
The main drafting organization of this Standard. Ministry of Communications Highway
Scientific Research Institute.
The organization participating in the drafting of this Standard. Guangdong Fuwa
Engineering Group Ltd.
The main drafters of this Standard. Nie Yuming, Liu Jiannong, Wu Zhiqiang and Huang
The standard JT/T 3139 replaced by this Standard was first issued in June, 1989.
Trailer Axle
1 Scope
This Standard specifies the types, basic parameters, technical requirements, test
methods and inspection rules for trailer axles (including wheel brake assembly and
chamber support).
This Standard applies to the axles used in the freight trailers with manufacturer's
maximum total mass not exceeding 8 t.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
JB/T 5000.3 Heavy Mechanical General Techniques and Standards – Part 3.
QC/T 239 Performance Requirements for Truck & Bus Brakes
QC/T 479 Trucks and Buses Brake Bench Test Method
QC/T 484 Automobile Paint Coating
3 Types
3.1 The trailer axles can be divided into two types in accordance with the tyre
mounting methods, including the single-tyre S (single) type and the double-tyre D
(double) type.
Load slowly from zero to the maximum test load. Record the displacement of each
measuring point by 8 levels (the displacement under the rated shaft load and the
maximum test load must be recorded). Each axle shall be tested three times. At the
beginning of each test, adjust the dial gauge (or displacement sensor) to zero. Strength test
After the vertical bending rigidity test, remove the dial gauge (or displacement sensor)
at each measuring point and load it continuously until the axle breaks. Record the load
at that time (i.e. the axle's failure load).
6.3.5 Data processing Calculate the numerical value of the ratio between the maximum
displacement and track under the full load of the axle, draw the displacements at all
measuring points under the full axle load and maximum test load, and connect these
points into a polyline. Calculate the axle bending backup coefficient
Kn = Pn / P
In the formula. Pn — vertical bending failure load, in kN;
P — rated axle load, in kN.
6.3.6 Result processing
Analyze the test sample data and write the test report or test result notice.
6.4 Vertical bending fatigue life test
6.4.1 Te......
Related standard: JT/T 475-2020