GB/T 19408.6-2020 PDF in English
GB/T 19408.6-2020 (GB/T19408.6-2020, GBT 19408.6-2020, GBT19408.6-2020)
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| GB/T 19408.6-2020 | English | 125 |
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Agricultural vehicles - Mechanical connections between towed and towing vehicles - Part 6: Specifications for nonswivel clevis couplings
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Standards related to (historical): GB/T 19408.6-2020
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GB/T 19408.6-2020: PDF in English (GBT 19408.6-2020) GB/T 19408.6-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.060.10
T 67
Agricultural vehicles - Mechanical connections between
towed and towing vehicles - Part 6: Specifications for non-
swivel clevis couplings
连接
(ISO 6489-5:2019, Agricultural vehicles - Mechanical connections between towed
and towing vehicles - Part 5: Specifications for non-swivel clevis couplings, MOD)
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: JUNE 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 Normative references ... 5
3 Terms and definitions... 5
4 Dimensions ... 6
5 Calculation of D value ... 7
6 Technical requirements ... 8
7 Installation location ... 8
8 Permissible mechanical connections between non-swivel clevis couplings and swivel
hitch rings ... 9
9 Marking ... 10
References ... 11
Agricultural vehicles - Mechanical connections between
towed and towing vehicles - Part 6: Specifications for non-
swivel clevis couplings
1 Scope
This Part of GB/T 19408 specifies the technical requirements for non-swivel clevis
couplings, which are used to connect agricultural towing vehicles that are equipped
with swivel hitch rings (as defined in GB/T 32538.3-2020).
This Part applies to the agricultural towing vehicles that are equipped with swivel hitch
rings (as defined in GB/T 32538.3-2020).
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 1592.1, Agricultural tractors - Rear-mounted power take-off types 1, 2, 3 and
4 - Part 1: General specifications, safety requirements, dimensions for master shield
and clearance zone (GB/T 1592.1-2016, ISO 500-1:2014, MOD)
GB/T 1800.1, Geometrical product specifications (GPS) - ISO code system for
tolerances on linear sizes - Part 1: Basis of tolerances, deviations and fits (GB/T
1800.1-2020, ISO 286-1:2010, MOD)
GB/T 1804-2000, General Tolerances - Tolerances for Linear and Angular
Dimensions without Individual Tolerance Indications (eqv ISO 2768-1:1989)
GB/T 32538.3-2020, Agricultural vehicles - Mechanical connections on towed
vehicles - Part 3: Swivel hitch rings (ISO 5692-3:2011, IDT)
3 Terms and definitions
The following terms and definitions are applicable to this document.
3.1
non-swivel clevis coupling
Hitching device, not rotating around the horizontal axis (pin) and longitudinal axis (pin),
for the mechanical connection of towing and towed vehicles.
3.2
coupling reference centre
The intersection of the pin centreline and the horizontally symmetrical centreline of the
clevis coupling.
3.3
D value
The value of the load acting on the towed vehicle along the longitudinal axis of the
vehicle.
Note: in kilonewtons (kN).
3.4
vertical load on the coupling point
The vertical load, under static load conditions, on the coupling reference centre.
Note: in kilograms (kg).
4 Dimensions
Values not specified in this Part shall be specified as appropriate. Tolerances on
dimensions without individual tolerance indications shall be in accordance with GB/T
1804-2000, Table 1, tolerance class C. Limits and fits shall be in accordance with GB/T
1800.1.
The dimensions of non-swivel clevis coupling shall be in accordance with Figure 1 and
Table 1.
D – the value of the load acting on the towed vehicle along the longitudinal axis of the
vehicle, in kilonewtons (kN);
g – the acceleration due to gravity, g = 9.81 m/s2;
mr – the allowable mass of the towed vehicle, in tones (t);
mt – the maximum allowable mass of the tractor or the curb mass of the towing vehicle,
in tones (t).
6 Technical requirements
6.1 The shape of the non-swivel clevis coupling shall be such that the swivel hitch ring
can meet the following minimum angles (see Figure 1):
-- ±60° in the horizontal plane (yaw);
-- ±20° in the vertical plane (pitch);
-- ±20° around its longitudinal axis (roll).
6.2 Where a fixing device is used between the tractor or towing vehicle and the non-
swivel clevis coupling, the fixing device shall be tested according to the maximum
bearing load of the non-swivel clevis coupling.
6.3 When a tractor or towing vehicle uses a non-swivel clevis coupling, in order to
avoid unintentional uncoupling, a safety device shall be provided, which shall be:
-- easy to apply;
-- retained on the hitch unit;
-- tested by the application of a static load of 0.25D.
6.4 The non-swivel clevis coupling shall be designed according to the D values
specified in Table 1.
7 Installation location
The non-swivel clevis coupling shall be installed on the longitudinal axis of the tractor
or towing vehicle, as shown in Figure 2. The distance t, between the centre of the non-
swivel clevis coupling and the end of the power take-off (PTO) shaft, is shown in Table
2. The installation of the non-swivel clevis coupling shall be as high as possible, without
any part of the clevis/ring coupling or its construction entering the clearance zone
specified for the PTO in GB/T 1592.1.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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