JT/T 475-2002 English PDF (JT/T475-2002)

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JT/T 475-2002: Trailer axle
JT/T 475-2002
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
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 ON. APRIL 26, 2002
IMPLEMENTED ON. JULY 1, 2002
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 
Foreword
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
Bohua.
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.
Welding
QC/T 239 Performance Requirements for Truck and 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.
6.3.4.2 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
6.3.5.1 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.
6.3.5.2 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 Test objective
It is to determine the vertical bending fatigue life of axles.
6.4.2 Test apparatus
They include hydraulic fatigue tester, strain gauge, oscilloscope, strain foil and so on.
6.4.3 Test procedure
6.4.3.1 Mounting
The sample mounting method is the same as that in 6.3.3.1.
6.4.3.2 Loading
Make the loading direction perpendicular to the axle centre-line, preload to the
maximum test load and repeat three times before unloading.