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GB/T 31879-2015 (GB/T31879-2015, GBT 31879-2015, GBT31879-2015) & related versions
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GB/T 31879-2015: PDF in English (GBT 31879-2015)
GB/T 31879-2015
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.080.10
T 71
Road Vehicles – General Technical
Requirements for Fifth Wheel
ISSUED ON: SEPTEMBER 11, 2015
IMPLEMENTED ON: DECEMBER 01, 2015
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Model ... 6
5 Technical Requirements ... 6
6 Test Methods ... 8
7 Inspection Rules ... 9
8 Mark, Transportation and Storage, Accompanying Document of Product .. 10
Road Vehicles – General Technical
Requirements for Fifth Wheel
1 Scope
This Standard specifies the model, technical requirements, test methods, inspection
rules, mark, transportation and storage of the fifth wheel, as well as the accompanying
document of the product.
This Standard is applicable to the 50# and 90# fifth wheels connected with the traction
pin specified in GB/T 4606 and GB/T 4607.
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) are applicable to this document.
GB/T 4357 Cold-Drawn Non-Alloy Steel Wire for Springs
GB/T 4606 Road Vehicles - 50 Semi-Trailer Fifth Wheel Coupling Pin - Basic and
Mounting/Interchangeability Dimensions
GB/T 4607 Road Vehicles - 90 Semi-Trailer Fifth Wheel Coupling Pin – Basic and
Mounting/Interchangeability Dimensions
GB/T 9969 General Principles for Preparation of Instructions for Use of Industrial
Products
GB/T 13306 Plate
GB/T 13880 Road Vehicles - Fifth Wheels - Interchangeability
GB/T 20069 Road Vehicle - Fifth Wheel Couplings Strength Tests
HG/T 2196-2004 Standard Classification System for Rubber Products in
Automotive Application
JB/T 5943 Engineering Machinery General Technical Specifications for
longitudinal swinging of the fifth wheel seat board with rubber damping.
5.1.6 The engaging between the fifth wheel locking hook and the traction pin shall be
reliable; and can realized the self-locking; the matching clearance shall be adjustable;
The adjustment mechanism shall be locked and have a safety device for anti-
looseness.
5.2 Parts requirements
5.2.1 The fifth wheel spring shall use the spring conforming to the provisions of GB/T
4357; after the spring is assembled, the tensile force shall be no less than 90% original
tensile force after 15000 stretching and rebound operations.
5.2.2 The rubber material for the fifth wheel shall use the Class-AA rubber material
specified in HG/T 2196-2004.
5.2.3 The welding quality of the components shall conform to the relevant provisions
of JB/T 5943.
5.2.4 The joint surface of the fifth wheel seat board shall be equipped with an oil
storage groove; the flatness of the joint surface shall be 1.0mm.
5.2.5 The hardness of the joint surface between the fifth wheel locking hook and
traction pin shall be HRC25~32; and shall be lower than the hardness of the joint
surface of the traction pin.
5.2.6 The exposed surface of the fifth wheel shall be treated for rust prevention.
5.2.7 The paint coating of the fifth wheel shall conform to the relevant provisions of
TQ4 in QC/T 484-1999.
5.2.8 The fifth wheel seat board shall be made of Q345 steel.
5.3 Performance requirements
5.3.1 The longitudinal swing angle of the fifth wheel seat board against the up and
down of the horizontal plane shall be no less than 12°, see Figure 1.
5.3.2 The lateral swing angle of the single axial line fifth wheel seat board against the
horizontal plane shall be no greater than 3°, and the damping sleeve shall be provided
at the rotating shaft. The lateral swing angle of the double axial line fifth wheel seat
board against the horizontal plane shall be no less than 3° and no greater than 7°, and
buffer device shall be added on the left and right sides. The lateral swing angle of the
rubber bearing fifth wheel against the horizontal surface shall be no greater than 5°.
5.3.3 The fifth wheel locking hook and traction pin shall be separated easily by hand;
the handle of the pull rod is set to the right of the driving direction; for 50# fifth wheel,
6.2.4 The force measured as per the methods of 6.2.2 and 6.2.3 shall meet the
requirements of 5.2.1, 5.3.3 and 5.3.5.
7 Inspection Rules
7.1 Exit-factory inspection
7.1.1 The fifth wheel can leave the factory after inspecting qualified by the quality
supervisions department of the manufacturer, and issuing the product certificate of
conformity.
7.1.2 The exit-factor inspection items are as follows:
a) Appearance;
b) 5.1.3, 5.1.4, 5.1.5, 5.1.6, 5.2.6, 5.3.1 and 5.3.2 of this Standard.
7.2 Type inspection
7.2.1 In case one of the following conditions, the product shall be carried out the type
inspection:
a) When the new and old products transfer to other factory for finalizing identification;
b) When the product performance may be influenced, after formal production, there
are major changes in structure, material, and process;
c) When every two years of the normal production and the output exceeds 20000
sets;
d) When the production is recovered after the shutdown for more than 1 year;
e) When the product supervision agency proposes the requirements for type
inspection.
7.2.2 The type inspection items shall be all the contents in Clause 5.
7.2.3 The fifth wheel for type inspection shall be randomly selected from the products
that have passed the factory inspection. The sampling base shall be no less than 100
sets; while the sampling number shall be 3 sets.
7.2.4 When any one sub-index in the type inspection fails, the number of sampling is
allowed to be double; reinspect such item. If the reinspection is qualified, then such
batch of products are judged as qualified; otherwise, they are disqualified.
......

BASIC DATA
Standard ID GB/T 31879-2015 (GB/T31879-2015)
Description (Translated English) Road vehicles -- General technical requirements for fifth wheel
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard T71
Classification of International Standard 43.080.10
Word Count Estimation 8,824
Date of Issue 2015-09-11
Date of Implementation 2015-12-01
Quoted Standard GB/T 4357; GB/T 4606; GB/T 4607; GB/T 9969; GB/T 13306; GB/T 13880; GB/T 20069; HG/T 2196-2004; JB/T 5943; QC/T 484-1999
Drafting Organization Ministry of Transport and Road Science Academy
Administrative Organization National Automotive Standardization Technical Committee
Regulation (derived from) National Standard Announcement 2015 No.25
Proposing organization Ministry of Industry and Information Technology of the People's Republic of China
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This Standard specifies the fifth wheel models, technical requirements, test methods, inspection rules, marks, transportation and storage as well as product accompanying documents. This Standard applies to each and GB/T 4606, GB/T 4607 provisions kingpins connected to number 50 and number 90, Block traction.