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GB/T 31879-2015 English PDF (GBT31879-2015)

GB/T 31879-2015 English PDF (GBT31879-2015)

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GB/T 31879-2015: Road vehicles -- General technical requirements for fifth wheel
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.
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.
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