GB/T 44044-2024 PDF English
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Road vehicles - Trailers up to 3.5 t - Requirements for jockey wheels and drawbar supports
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GB/T 44044-2024: Road vehicles - Trailers up to 3.5 t - Requirements for jockey wheels and drawbar supports
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT44044-2024
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 43.100
CCS T 71
Road vehicles - Trailers up to 3.5 t - Requirements for jockey
wheels and drawbar supports
(ISO 13052.2013, MOD)
Issued on: MAY 28, 2024
Implemented on: SEPTEMBER 1, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Technical requirements... 6
5 Test methods... 7
6 Marking, installation, operation and maintenance instructions... 10
Appendix A (Informative) Structure number comparison table... 12
References... 14
Road vehicles - Trailers up to 3.5 t - Requirements for jockey
wheels and drawbar supports
1 Scope
This document specifies the technical requirements, test methods, marking, installation,
operation and maintenance instructions for jockey wheels and support devices.
This document applies to the design, manufacture, installation and use of jockey wheels
and support devices on single-axle (center-axle) rigid drawbar trailers with a total mass
not exceeding 3.5 t.
2 Normative references
This document has no normative references.
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 jockey wheel
A device installed at the front of the trailer to support the weight of the front of the
trailer and adjust the height of the drawbar when the trailer is disconnected from the
towing vehicle.
NOTE. When the trailer is disconnected from the towing vehicle, the device supports the trailer to move
stably in any direction on the ground.
3.2 drawbar support device
A mechanical device connected to the trailer's drawbar, which has a height adjustment
function to ensure that the trailer remains level when it is disconnected from the towing
vehicle.
NOTE 1.It consists of a vertical tubular support and a manual height adjustment mechanism with a
locking and/or clamping system.
NOTE 2.The device is assembled as a lifting system and the shaft of the connecting ball can be separated
from the connecting ball.
3.10 drawbar eyes
With a hole matching the 50 mm diameter pin, it is installed on the trailer's drawbar to
connect the mechanical part of the automatic drawbar connector.
3.11 load lifting capacity
The maximum vertical mass that can be lifted by a jockey wheel or a drawbar support
device with a lifting function.
NOTE. The unit is kilogram (kg).
4 Technical requirements
4.1 Bench test requirements
After testing according to 5.3, the jockey wheels or the drawbar support device shall
not move (slide).
After the test load is stopped being applied, the jockey wheels shall have no visible
damage or deformation, function normally, and their load lifting capacity shall not be
lower than the test load.
4.2 Static vehicle test requirements
During the test according to 5.4, there shall be no movement (slippage) of the jockey
wheels or the drawbar support device.
After the test load is stopped being applied, there shall be no visible damage or
deformation of the strut and components.
4.3 The operating force requirements for the jockey wheel operating handle and
T-bolt in the working state (the trailer is disconnected from the towing vehicle)
The operating force of the jockey wheel operating handle and T-bolt shall not be greater
than 250 N, and the strut shall be securely locked under the nose weight condition.
4.4 Installation protection requirements in a non-working state (trailer connected
to towing vehicle)
4.4.1 When the jockey wheels and support devices are in the retracted state, protective
devices shall be installed to prevent them from being accidentally released and parts
from loosening or falling.
4.4.2 The movable handles and other parts used when the jockey wheels and support
device are in a working state shall be securely fastened when they are retracted to
prevent them from falling off and being lost.
4.4.3 When the jockey wheels and support device are extended, the parts shall not
separate abnormally; the design of the safety protection device shall ensure that the
handle operating force can still function at 250 N.
4.4.4 When the trailer is in the horizontal connection state, the minimum ground
clearance of the jockey wheels and/or clamping system shall not be less than 150 mm.
4.4.5 When the trailer is in motion, the adjustment mechanism with functions such as
the lifting and lowering or up and down swinging of the screw shall not move due to
vibration.
4.5 Design requirements
4.5.1 The drawbar support device shall be designed and installed with a protective
device to prevent the strut locking tool from being lost or falling off due to the vibration
of the trailer during driving, thereby causing scratches on the ground.
4.5.2 The drawbar support device with a lifting system shall have relevant mechanisms
to prevent the inner and outer casings from accidentally separating.
4.5.3 After the drawbar support device is installed, the ground clearance of the trailer
in the horizontal non-connected state shall be no less than 150 mm.
4.5.4 The operating handle and other moving parts shall be securely fixed and shall not
become loose or fall off when not in operation.
5 Test methods
5.1 Test load
The jockey wheels and support device shall be able to withstand twice the static vertical
allowable load lifting capacity in the vertical direction. The test load calculation
formula is shown in formula (1).
Where.
PT -- the test load, in kilograms (kg);
PS -- the static vertical allowable load lifting capacity, in kilograms (kg).
5.2 Lifting force
5.3 Bench test procedure
The bench test is carried out in the following steps.
a) Fix it stably to the test bench with a threaded plate or clamping locator;
b) Use the clamping accessory to ensure that the jockey wheel is firmly clamped
and the main casing is in a vertical state;
c) With the main casing in a vertical position, turn the handle to adjust the height
of the jockey wheel to the highest position specified by the manufacturer;
d) Determine the test position of the jockey wheel, which is located at the front
end of the clamping accessory or the fastening plate;
e) Apply the test load determined in 5.1 and maintain it for 5 min.
5.4 Static vehicle test procedure
Static vehicle testing is carried out in the following steps.
a) Place the trailer on a flat, level ground;
b) Check the drawbar support device to ensure that the trailer coupling head has
an adjustable height of 550 mm from the ground (the drawbar support device
uses the lifting function);
c) Check the drawbar support device to ensure the ability to adjust the height of
the trailer coupling head from the ground (the drawbar support device does not
use the lifting function);
d) Make the jockey wheel installation position bear a vertical static load of twice
the lifting force;
e) Apply a maximum force of 250 N on the operating handle to operate the
clamping system or locking system and lock the strut of the drawbar support
device. The test shall use new products without damage;
f) After the test load is applied for 1 min, the jockey wheel or the drawbar support
device shall not move (slide) at all [the height of the traction connection point
of the towing vehicle is adjusted according to b) or c)];
g) Adjust the strut height to the middle position and repeat the above test steps
d)~f);
h) When the drawbar support device is retracted in the combination state, the
height of the lower end of the drawbar support device from the ground shall
not be less than 150 mm.
6 Marking, installation, operation and maintenance
instructions
6.1 Marking
Permanent markings shall be placed on the visible parts of the non-movable outer
surfaces of the jockey wheels and support devices, and the following contents shall be
marked.
-- the name of the manufacturer;
-- the load lifting capacity.
6.2 Installation
6.2.1 The jockey wheels shall be securely installed and maintain an operating space of
not less than 25 mm with the surrounding fixtures.
6.2.2 The selection and installation of the jockey wheels shall ensure that the lifting
height from the center of the drawbar spherical connection device to the ground is not
less than 550 mm.
6.2.3 After the jockey wheels are installed and fixed, the ground clearance when driving
shall be no less than 150 mm.
6.2.4 The exact installation position of the jockey wheels shall be designed and
determined by the trailer manufacturer and shall meet the following requirements.
a) The distance between the operating handle, strut and other parts of the drawbar
support device and the surrounding fixing devices shall not be less than 25
mm;
b) The jockey wheel lifting mechanism can ensure that the height from the center
of the trailer coupling head to the ground is adjusted to 550 mm;
c) When the trailer is not connected and only the jockey wheels and support
device are used, the jockey wheels and the struts of the support device can
ensure the stability of the trailer within the working height range.
6.2.5 When not in operation, the jockey wheels should be raised to the highest position
and securely fixed.
6.3 Operation and maintenance instructions
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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