GB/T 39015.2-2020 (GB/T39015.2-2020, GBT 39015.2-2020, GBT39015.2-2020)
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| GB/T 39015.2-2020 | English | 155 |
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Road vehicles--Interchangeability of mechanical couplings between tractors and semi-trailers--Part 2: Low-coupling tractors and high-volume semi-trailers
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GB/T 39015.2-2020
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Standards related to: GB/T 39015.2-2020
| Standard ID | GB/T 39015.2-2020 (GB/T39015.2-2020) | | Description (Translated English) | Road vehicles--Interchangeability of mechanical couplings between tractors and semi-trailers--Part 2: Low-coupling tractors and high-volume semi-trailers | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | T72 | | Classification of International Standard | 43.080.10 | | Word Count Estimation | 10,193 | | Date of Issue | 2020-07-21 | | Date of Implementation | 2021-02-01 | | Drafting Organization | Highway Research Institute, Ministry of Transport, Yost (China) Automotive Parts Co., Ltd., Shandong Defang Hydraulic Machinery Co., Ltd., CIMC Vehicles (Group) Co., Ltd., China National Heavy Duty Truck Group Co., Ltd., Beijing Foton Daimler Automobile Co., Ltd | | Administrative Organization | National Automotive Standardization Technical Committee (SAC/TC 114) | | Proposing organization | Ministry of Industry and Information Technology of the People's Republic of China | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 39015.2-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.080.10
T 72
Road vehicles - Interchangeability of mechanical
couplings between tractors and semi-trailers - Part 2:
Low-coupling tractors and high-volume semi-trailers
(ISO 1726-2:2007, Road vehicles - Mechanical couplings between tractors
and semi-trailers - Part 2: Interchangeability between low-coupling tractors
and high-volume semi-trailers, MOD)
ISSUED ON: JULY 21, 2020
IMPLEMENTED ON: FEBRUARY 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Interchangeability size ... 5
3 Control size ... 9
4 Marks ... 11
Foreword
GB/T 39015 “Road vehicles - Interchangeability of mechanical couplings
between tractors and semi-trailers” consists of two parts:
- Part 1: Semi-trailer tractors and semi-trailers for general cargo
transportation;
- Part 2: Low-coupling tractors and high-volume semi-trailers.
This Part is Part 2 of GB/T 39015.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part uses redrafting method to modify and adopt ISO 1726-2:2007 “Road
vehicles - Mechanical couplings between tractors and semi-trailers - Part 2:
Interchangeability between low-coupling tractors and high-volume semi-
trailers”.
The technical differences and reasons between this Part and ISO 1726-2:2007
are as follows:
- modified Clause 1 as “This Part of GB/T 39015 specifies interchangeability
size, control size and marks of interchangeability of mechanical couplings
between tractors and semi-trailers. This Part is applicable to two-axle
semi-trailer tractors and matching semi-trailers.”; added marking
requirements to the scope based on the actual content of this Part; at the
same time, deleted the description of the maximum allowable total mass
and outline size that has nothing to do with the content;
- modified "L3=1800mm" in 2.4.2 to "L3≤1800mm" to meet the requirements
of the trailer size limit in the relevant national standards of China.
This Part made the following editorial modifications:
- modified the standard name to “Road vehicles - Interchangeability of
mechanical couplings between tractors and semi-trailers - Part 2: Low-
coupling tractors and high-volume semi-trailers”;
- added notes to r2 and r3 in Figure 3b);
- deleted Bibliography in ISO 1726-2:2007.
This Part was proposed by Ministry of Industry and Information Technology of
the People's Republic of China.
Road vehicles - Interchangeability of mechanical
couplings between tractors and semi-trailers - Part 2:
Low-coupling tractors and high-volume semi-trailers
1 Scope
This Part of GB/T 39015 specifies interchangeability size, control size and
marks of interchangeability of mechanical couplings between tractors and semi-
trailers.
This Part is applicable to two-axle semi-trailer tractors and matching semi-
trailers.
2 Interchangeability size
2.1 Ground clearance of coupling of tractor under maximum load
Under the maximum load condition, the height h of the joint surface of the
coupling of tractor (see Figure 1) shall be 900mm~975mm.
Figure 1 -- Ground clearance of coupling of tractor
2.2 Ground clearance of coupling of tractor when disengaged from semi-
trailer
part of the gooseneck of the semi-trailer [see 2.4.1d)];
w1 - Forward angle;
w2 - Backward angle;
φ - Articulation angle.
Figure 2 -- Free space between tractor and semi-trailer
2.4 Gooseneck shape
2.4.1 The gooseneck shape shall be located on the outer area of the surface
composed of multiple different planes and a rotating surface connecting the two
planes. There shall be a smooth transition between the surfaces, as shown in
Figure 3. The planes and rotating surfaces are determined as follows:
a) The first plane AB is perpendicular to the horizontal plane of the traction
pin axis. The length is L1. The width is the same as the width of semi-trailer,
and ends at the intersection with the second plane as described in b);
b) For the second plane BC, the width is same with the width of semi-trailer.
The angle with the first plane is γ1. It ends with the line of intersection with
the third plane as described in c);
c) For the third plane CD, the width is same with the width of semi-trailer. The
angle with the first plane is γ2. It ends to the line of intersection with the
rotating surface as described in d);
d) A vertical line segment EF and a segment of arc DE with a radius of r2
between the third plane and the vertical line segment, form a rotation
curve. The rotation curve takes r3 as radius to rotate around the traction
pin axis to form a rotating surface. Each surface shall be continuous;
e) The fourth plane AU is a horizontal plane at the front end of the semi-trailer
and perpendicular to the traction pin of the semi-trailer. The length is L3.
The width is same with the width of semi-trailer. It ends to the intersection
of the inclined plane UV with an angle α of the horizontal plane. The
foremost point V shall not exceed the vertical plane rotated with a radius
of 2040mm as the center of the traction pin axis.
2.4.2 The shape of the gooseneck is determined by the following parameters:
- The horizontal length of the first plane, L1=500mm;
- The sum of the horizontal length of the first plane and the second plane,
L2=1350mm;
- The horizontal length of the fourth plane, L3≤1800mm;
- The arc radius between the third plane and the vertical line of the
keys:
L1 - The horizontal length of the first plane (AB);
L2 - The sum of the horizontal lengths of the first plane and the second plane (AB and BC);
L3 - The horizontal length of the fourth plane (AU);
r1 - Front turning radius of semi-trailer;
r2 - Arc radius (DE);
r3 - The radius of rotation (EF) formed by the distance between the axis of the traction pin
and the vertical line of the gooseneck;
α - The angle between the horizontal plane and the inclined plane;
γ1 - The angle between the second plane (BC) and the first plane (AB);
γ2 - The angle between the third plane (CD) and the first plane (AB).
Figure 3 (continued)
3 Control size
3.1 Longitudinal inclination angle of semi-trailer relative to tractor
When a semi-trailer train is running straight, when the front and rear inclination
angles of semi-trailer relative to tractor (see Figure 2) meet the following
requirements, it shall not contact with the tractor (except hinged parts):
- Forward angle w1≤3.5°;
- Backward angle w2≤4.5°.
3.2 Lateral inclination angle
When the lateral inclination angle δ of semi-trailer relative to tractor (see Figure
4) changes within ±2°, there shall be no interference between tractor and semi-
trailer.
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