GB/T 39015.2-2020 PDF English

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GB/T 39015.2-2020: 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: 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 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. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.

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